diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index e5183ac23..b22247b6d 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -2,7 +2,7 @@
 Add resource(s) | Remove resource(s) | Add info | Improve repo
 
 ## For resources
-### Description 
+### Description
 
 ### Why is this valuable (or not)?
 
diff --git a/CONTRIBUTING-zh.md b/CONTRIBUTING-zh.md
index cb4e407a6..c6f600ad5 100644
--- a/CONTRIBUTING-zh.md
+++ b/CONTRIBUTING-zh.md
@@ -63,7 +63,7 @@
 * Sections(章节/段落)使用3级标题(`###`)，subsections(子段落/子章节)使用4级标题 (`####`)。
 
 
-#### 整体思想为：   
+#### 整体思想为：
 
 * `2` ：新添加的Section与末尾链接间必须留有`2`个空行
 * `1` ：标题和第一个链接之间必须留有`1`个空行的空行
@@ -71,7 +71,7 @@
 * `1` ：每个`.md`文件末尾必须留有`1`个空行
 
 
-#### 举例：   
+#### 举例：
 
 ```
 [...]
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 142f7353d..f72a13052 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -194,7 +194,7 @@ There are lots of books that we list that don't have these attributes; it can de
 
 Sometimes these can be hard to distinguish!
 
-Courses often have associated textbooks, which we would list in our books lists. Courses have lectures, exercises, tests, notes or other didactic aids. A single lecture or video by itself is not a course. A powerpoint is not a course. 
+Courses often have associated textbooks, which we would list in our books lists. Courses have lectures, exercises, tests, notes or other didactic aids. A single lecture or video by itself is not a course. A powerpoint is not a course.
 
 
 ##### Interactive Tutorials vs. Other stuff
diff --git a/books/free-programming-books-bl.md b/books/free-programming-books-bl.md
index eeaaef42b..af911b2cd 100644
--- a/books/free-programming-books-bl.md
+++ b/books/free-programming-books-bl.md
@@ -13,17 +13,17 @@
 
 * [C - All you need to know](https://www.youtube.com/playlist?list=PL_XxuZqN0xVASsjyqiNzgjUWHbDkN2Scy) - Stack Learner
 * [C Programming Bangla Tutorial Course](https://www.youtube.com/playlist?list=PLgH5QX0i9K3pCMBZcul1fta6UivHDbXvz) - Anisul Islam
-* [Computer Programming](http://cpbook.subeen.com/p/blog-page.html) - Tamim Shahriar Subeen 
+* [Computer Programming](http://cpbook.subeen.com/p/blog-page.html) - Tamim Shahriar Subeen
 
 
 <h3 id="cpp">C++</h3>
 
-* [C++ Bangla Tutorial Course](https://www.youtube.com/playlist?list=PLgH5QX0i9K3q0ZKeXtF--CZ0PdH1sSbYL) - Anisul Islam 
+* [C++ Bangla Tutorial Course](https://www.youtube.com/playlist?list=PLgH5QX0i9K3q0ZKeXtF--CZ0PdH1sSbYL) - Anisul Islam
 
 
 ### Competitive Programming
 
-* [Dynamic Programming Book](https://dp-bn.github.io) - Tasmeem Reza and Mamnoon Siam 
+* [Dynamic Programming Book](https://dp-bn.github.io) - Tasmeem Reza and Mamnoon Siam
 
 
 ### JavaScript
diff --git a/books/free-programming-books-et.md b/books/free-programming-books-et.md
index b553d7ab1..13a80148e 100644
--- a/books/free-programming-books-et.md
+++ b/books/free-programming-books-et.md
@@ -40,7 +40,7 @@
 * [Angular](http://www.cs.tlu.ee/teemad/get_file.php?id=400) - Tallinna Ülikooli õppematerjal
 
 
-##### Vue 
+##### Vue
 
 * [Vue](http://www.cs.tlu.ee/teemaderegister/get_file.php?id=715) - Tallinna ülikooli õppematerjal
 
diff --git a/books/free-programming-books-ko.md b/books/free-programming-books-ko.md
index 4a01ef2f7..e4f9ed08f 100644
--- a/books/free-programming-books-ko.md
+++ b/books/free-programming-books-ko.md
@@ -135,7 +135,7 @@
 
 #### Django
 
-* [장고걸스 튜토리얼 (Django Girls Tutorial)](https://tutorial.djangogirls.org/ko/) (1.11) (HTML) (:construction: *in process*)  
+* [장고걸스 튜토리얼 (Django Girls Tutorial)](https://tutorial.djangogirls.org/ko/) (1.11) (HTML) (:construction: *in process*)
 * [점프 투 장고](https://wikidocs.net/book/4223) - 박응용
 
 
diff --git a/books/free-programming-books-ru.md b/books/free-programming-books-ru.md
index 1bafaedde..8ed80f5a6 100644
--- a/books/free-programming-books-ru.md
+++ b/books/free-programming-books-ru.md
@@ -332,7 +332,7 @@
 * [Путь к изучению React](https://leanpub.com/the-road-to-learn-react-russian) - Алексей Пыльцын (PDF, ePub, MOBI) *(Требуется аккаунт на Leanpub или действительный адрес электронной почты)*
 * [Руководство по React](https://metanit.com/web/react) - Евгений Попов
 * [Уроки по React](https://codedzen.ru/category/uroki/react)
-* [Учебник по фреймворку React](http://old.code.mu/books/advanced/javascript/react/) 
+* [Учебник по фреймворку React](http://old.code.mu/books/advanced/javascript/react/)
 
 
 #### Vue.js
diff --git a/books/free-programming-books.md b/books/free-programming-books.md
index 5d902609b..d60e05e20 100644
--- a/books/free-programming-books.md
+++ b/books/free-programming-books.md
@@ -1100,7 +1100,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [MIA 90-02: BETA Compiler - Reference Manual](https://beta.cs.au.dk/Manuals/latest/compiler/index.html) - Mjølner Informatics
 * [MIA 94-26: BETA Language Introduction - Tutorial](https://beta.cs.au.dk/Manuals/latest/beta-intro/index.html) - Mjølner Informatics
 * [MIA 99-41: BETA Language Modifications - Reference Manual](https://beta.cs.au.dk/Manuals/latest/beta/beta-index.html) - Mjølner Informatics
-* [MIA 99-42: The Fragment System: Further Specification](https://beta.cs.au.dk/Manuals/latest/beta/fragment.html) - Mjølner Informatics 
+* [MIA 99-42: The Fragment System: Further Specification](https://beta.cs.au.dk/Manuals/latest/beta/fragment.html) - Mjølner Informatics
 * [Object-Oriented Programming in the BETA Programming Language](https://beta.cs.au.dk/Books/) - Ole Lehrmann Madsen, Birger Møller-Pedersen, Kristen Nygaard
 
 
@@ -2912,7 +2912,7 @@ Kerridge (PDF) (email address *requested*, not required)
 #### Angular
 
 * [Angular 2+ Notes for Professionals](https://goalkicker.com/Angular2Book/) - Compiled from StackOverflow documentation (PDF)
-* [Angular Docs](https://angular.io/docs) 
+* [Angular Docs](https://angular.io/docs)
 * [Build a Full-Stack Web Application Using Angular & Firebase](https://www.c-sharpcorner.com/ebooks/build-a-full-stack-web-application-using-angular-and-firebase) - Ankit Sharma
 
 
diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index b15b8f9ef..17a1d1a7b 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -680,10 +680,10 @@
 ### Rust
 
 * [Intro to Rust](https://www.youtube.com/playlist?list=PLJbE2Yu2zumDF6BX6_RdPisRVHgzV02NW) - Tensor Programming
-* [Rust Basics](https://www.youtube.com/playlist?list=PLlcnQQJK8SUjApd95LIcd3K9XXmE-IeCS) - Engineer Man 
+* [Rust Basics](https://www.youtube.com/playlist?list=PLlcnQQJK8SUjApd95LIcd3K9XXmE-IeCS) - Engineer Man
 * [Rust Crash Course](https://www.youtube.com/watch?v=zF34dRivLOw) - Traversy Media
 * [Rust Projects](https://www.youtube.com/playlist?list=PLJbE2Yu2zumDD5vy2BuSHvFZU0a6RDmgb) - Tensor Programming
-* [Rust Tutorial](https://www.youtube.com/playlist?list=PLLqEtX6ql2EyPAZ1M2_C0GgVd4A-_L4_5) - Doug Milford 
+* [Rust Tutorial](https://www.youtube.com/playlist?list=PLLqEtX6ql2EyPAZ1M2_C0GgVd4A-_L4_5) - Doug Milford
 
 
 ### Scala
diff --git a/courses/free-courses-fa_IR.md b/courses/free-courses-fa_IR.md
index 3fda4676b..803bb1b5d 100644
--- a/courses/free-courses-fa_IR.md
+++ b/courses/free-courses-fa_IR.md
@@ -31,7 +31,7 @@
 * [آموزش جاوا - سکان‌آکادمی](https://sokanacademy.com/courses/java) - Behzad Moradi
 * [آموزش جاوا از صفر](https://toplearn.com/courses/85/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-%D8%AC%D8%A7%D9%88%D8%A7-%D8%A7%D8%B2-%D8%B5%D9%81%D8%B1) - Mohammad Ghari
 * [برنامه نویسی پیشرفته(جاوا)](https://maktabkhooneh.org/course/%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87-%D9%86%D9%88%DB%8C%D8%B3%DB%8C-%D9%BE%DB%8C%D8%B4%D8%B1%D9%81%D8%AA%D9%87-%D8%AC%D8%A7%D9%88%D8%A7-mk242) - Gholamali Nejad Hajali Irani
-* [برنامه‌نویسی حرفه‌ای تحت وب در جاوا](https://maktabkhooneh.org/course/%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87-%D9%86%D9%88%DB%8C%D8%B3%DB%8C-%D8%AD%D8%B1%D9%81%D9%87-%D8%A7%DB%8C-%D8%AA%D8%AD%D8%AA-%D9%88%D8%A8-%D8%AF%D8%B1-%D8%AC%D8%A7%D9%88%D8%A7-mk282) - Gholamali Nejad Hajali Irani 
+* [برنامه‌نویسی حرفه‌ای تحت وب در جاوا](https://maktabkhooneh.org/course/%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87-%D9%86%D9%88%DB%8C%D8%B3%DB%8C-%D8%AD%D8%B1%D9%81%D9%87-%D8%A7%DB%8C-%D8%AA%D8%AD%D8%AA-%D9%88%D8%A8-%D8%AF%D8%B1-%D8%AC%D8%A7%D9%88%D8%A7-mk282) - Gholamali Nejad Hajali Irani
 
 
 ### Linux
@@ -55,7 +55,7 @@
 
 #### Codeigniter
 
-* [طراحی وب Codeigniter](https://maktabkhooneh.org/course/%D8%B7%D8%B1%D8%A7%D8%AD%DB%8C-%D9%88%D8%A8-Codeigniter-mk136) - 
+* [طراحی وب Codeigniter](https://maktabkhooneh.org/course/%D8%B7%D8%B1%D8%A7%D8%AD%DB%8C-%D9%88%D8%A8-Codeigniter-mk136)
 
 
 #### Laravel
@@ -68,7 +68,7 @@
 
 #### Yii
 
-* [آموزش yii framework 2](https://maktabkhooneh.org/course/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-yii-framework-2-mk205) - Mehrdad Seifzade 
+* [آموزش yii framework 2](https://maktabkhooneh.org/course/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-yii-framework-2-mk205) - Mehrdad Seifzade
 
 
 ### Python
@@ -84,4 +84,4 @@
 
 ### Web Development
 
-* [برنامه نویسی وب](https://maktabkhooneh.org/course/%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87-%D9%86%D9%88%DB%8C%D8%B3%DB%8C-%D9%88%D8%A8-mk74) - Mohammad Salehe 
+* [برنامه نویسی وب](https://maktabkhooneh.org/course/%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D9%87-%D9%86%D9%88%DB%8C%D8%B3%DB%8C-%D9%88%D8%A8-mk74) - Mohammad Salehe
diff --git a/courses/free-courses-hi.md b/courses/free-courses-hi.md
index 9d02366d4..0b8012271 100644
--- a/courses/free-courses-hi.md
+++ b/courses/free-courses-hi.md
@@ -51,7 +51,7 @@
 ### Java
 
 * [Java + DS + Algorithms](https://www.youtube.com/playlist?list=PLKKfKV1b9e8ps6dD3QA5KFfHdiWj9cB1s) - Apni Kaksha (Anuj)
-* [Java Tutorials For Beginners In Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9agS67Uits0UnJyrYiXhDS6q) - Harry 
+* [Java Tutorials For Beginners In Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9agS67Uits0UnJyrYiXhDS6q) - Harry
 * [Spring Boot Tutorial For Beginners (in Hindi)](https://www.youtube.com/playlist?list=PL5mjp3QjkuoLPS-L28yKCKyzCMX8WRVno) - ProgRank
 * [The complete Java tutorial \| Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9agS67Uits0UnJyrYiXhDS6q) - Harry
 
diff --git a/courses/free-courses-id.md b/courses/free-courses-id.md
index 9c38d0bc0..7cdf5c56d 100644
--- a/courses/free-courses-id.md
+++ b/courses/free-courses-id.md
@@ -80,7 +80,7 @@
 
 ### Desain dan Arsitektur
 
-* [Belajar Prinsip Pemrograman SOLID](https://www.dicoding.com/academies/169) - Dicoding, membutuhkan registrasi 
+* [Belajar Prinsip Pemrograman SOLID](https://www.dicoding.com/academies/169) - Dicoding, membutuhkan registrasi
 
 
 ### Docker
@@ -128,7 +128,7 @@
 * [Belajar Java - Object Oriented Programming Bahasa Indonesia (Lanjut)](https://www.youtube.com/playlist?list=PLZS-MHyEIRo6V4_vk1s1NcM2HoW5KFG7i) - Kelas Terbuka
 * [Belajar Java Bahasa Indonesia (Dasar)](https://www.youtube.com/playlist?list=PLZS-MHyEIRo51w0Hmqi0C8h2KWNzDfo6F) - Kelas Terbuka
 * [Belajar Java Lambda Expression](https://www.youtube.com/playlist?list=PL-CtdCApEFH_71iT2klDSWIC0MScpLheN) - Programmer Zaman Now
-* [Memulai Pemrograman dengan Java](https://www.dicoding.com/academies/60) - Dicoding, membutuhkan registrasi 
+* [Memulai Pemrograman dengan Java](https://www.dicoding.com/academies/60) - Dicoding, membutuhkan registrasi
 
 
 ### Spring
diff --git a/courses/free-courses-it.md b/courses/free-courses-it.md
index 8c2b5f4c0..ddfa6afac 100644
--- a/courses/free-courses-it.md
+++ b/courses/free-courses-it.md
@@ -30,7 +30,7 @@
   * [Maven](#maven)
 * [Web](#web)
   * [Vue](#vue)
-* [Workshop](#workshop)  
+* [Workshop](#workshop)
 
 
 ### Algoritmi e Strutture Dati
@@ -58,7 +58,7 @@
 
 ### C Sharp
 
-* [Programmazione ad oggetti in C#](https://www.youtube.com/watch?v=aSgikNnGEKM&list=PLktbfd3yXeH8yQpHM3O468k8l-aTC6Hl6) - G. Pellegrini Parisi 
+* [Programmazione ad oggetti in C#](https://www.youtube.com/watch?v=aSgikNnGEKM&list=PLktbfd3yXeH8yQpHM3O468k8l-aTC6Hl6) - G. Pellegrini Parisi
 
 
 <h3 id="cpp">C++</h3>
@@ -102,7 +102,7 @@
 * [Automi e Linguaggi Formali](https://www.youtube.com/playlist?list=PLhEwqlL10MqNz1pA7R5jnB_gsMIhDOe5X) - Bresolin e Filè (Università di Padova)
 * [Fondamenti di Informatica](https://www.youtube.com/playlist?list=PLUL1bzfXcbX3g2cIcTFdmvj5yawQtUOxJ) - C. De Stefano (Università di Cassino e del Lazio Meridionale)
 * [Informatica](https://didattica.polito.it/pls/portal30/sviluppo.videolezioni.vis?cor=232) - M. Mezzalama (Politecnico di Torino)
-* [Informatica di Base - Corso intensivo](https://www.youtube.com/playlist?list=PLG31HS6yEI8dv6TUmv9w0W6YmEAQm0P2q) - G. Pellegrini Parisi 
+* [Informatica di Base - Corso intensivo](https://www.youtube.com/playlist?list=PLG31HS6yEI8dv6TUmv9w0W6YmEAQm0P2q) - G. Pellegrini Parisi
 * [Informatica I - Modelli dell'Informatica](https://www.youtube.com/playlist?list=PLAQopGWlIcyalkb2baN9mnotsdBm5Vbkc) - A. Marchetti Spaccamela (Università La Sapienza Università di Roma)
 * [Sistemi di Calcolo](https://www.youtube.com/playlist?list=PLAQopGWlIcybT12h7fjVvlGAeSqOKDnTA) - C. Demetrescu (Università La Sapienza di Roma)
 * [Teoria dell'informazione](https://www.youtube.com/playlist?list=PL0qAPtx8YtJeGo5g4Esi7tm6kHPRivkvb) (F. Camuso)
@@ -124,7 +124,7 @@
 
 ### Machine Learning
 
-* [Machine Learning in italiano col Pollo Watzlawick](https://www.youtube.com/playlist?list=PLa-sizbCyh93c0nSPAb8k5ZZeOq4SBIl9) (P. Savastano) 
+* [Machine Learning in italiano col Pollo Watzlawick](https://www.youtube.com/playlist?list=PLa-sizbCyh93c0nSPAb8k5ZZeOq4SBIl9) (P. Savastano)
 
 
 ### Mobile
@@ -134,7 +134,7 @@
 
 ### Networking
 
-* [Advanced Networking 2016](https://www.youtube.com/playlist?list=PLkbnRIR2azkIXO-ndOz7qBvVC38_wbOW8) (Hacklab Cosenza) 
+* [Advanced Networking 2016](https://www.youtube.com/playlist?list=PLkbnRIR2azkIXO-ndOz7qBvVC38_wbOW8) (Hacklab Cosenza)
 
 
 ### Pascal
diff --git a/courses/free-courses-vi.md b/courses/free-courses-vi.md
index 5629192b9..48e2150be 100644
--- a/courses/free-courses-vi.md
+++ b/courses/free-courses-vi.md
@@ -58,7 +58,7 @@
 * [AngularJS Cơ Bản](https://www.youtube.com/watch?v=1MOFT2_-NII&list=PLRhlTlpDUWsw70vZAkJgALJ1yhgYsqDGx) - TEDU
 
 
-### ASP 
+### ASP
 
 * [Khóa học ASP.NET Core cơ bản](https://tedu.com.vn/khoa-hoc/khoa-hoc-aspnet-core-co-ban-14.html) - TEDU
 
@@ -215,7 +215,7 @@
 
 ### TypeScript
 
-* [TypeScript căn bản](https://www.youtube.com/watch?v=L5mM4KWVyXE&list=PLv6GftO355AsQtYp_YrsqEihOCiNlZkCb) - ZendVN 
+* [TypeScript căn bản](https://www.youtube.com/watch?v=L5mM4KWVyXE&list=PLv6GftO355AsQtYp_YrsqEihOCiNlZkCb) - ZendVN
 * [TypeScript căn bản (ES6)](https://tedu.com.vn/khoa-hoc/khoa-hoc-su-dung-typescript-can-ban-9.html) - TEDU
 
 
diff --git a/more/free-programming-interactive-tutorials-en.md b/more/free-programming-interactive-tutorials-en.md
index 63d8b3e48..65bd60c1e 100644
--- a/more/free-programming-interactive-tutorials-en.md
+++ b/more/free-programming-interactive-tutorials-en.md
@@ -85,7 +85,7 @@
 * [Try Clojure](http://www.tryclj.com)
 
 
-### Cloud Computing 
+### Cloud Computing
 
 * [AWS API Gateway](https://run.qwiklabs.com/focuses/269?catalog_rank=%7B%22rank%22%3A3%2C%22num_filters%22%3A1%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3605949) - *registration required*
 * [AWS Identity and Access Management (IAM)](https://run.qwiklabs.com/focuses/7782?catalog_rank=%7B%22rank%22%3A6%2C%22num_filters%22%3A1%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=3605942) - *registration required*
@@ -159,7 +159,7 @@
 
 * [CodingBat code practice](http://codingbat.com/java)
 * [Java at Codecademy](https://www.codecademy.com/courses/learn-java)
-* [Java Tutorial](https://www.w3schools.com/java) - W3Schools 
+* [Java Tutorial](https://www.w3schools.com/java) - W3Schools
 * [Learn Java](http://www.learnjavaonline.org)
 * [Learneroo Java tutorial](https://www.learneroo.com/modules/11)