* Added Arduino books.

* Added pdf annotation to a book.

* Update free-programming-books.md

* Update free-programming-books.md

* Added two Spanish JS books

Apuntes de Javascript II and Apuntes de Javascript III

* Revert "Added two Spanish JS books"

This reverts commit 1562767ca06037218b73a2d1d53277a65d37c616.

* Added Descubre React book

* Corrected alphabetical order

* Added leanpub account warning

* Added Bulgarian Eloquent JavaScript

Added the Bulgarian translation of Eloquent JavaScript (title is untranslated in the Bulgarian book)

* Removed trailing slash

* Update free-courses-en.md

This is a course from Harvard University's CS50 about Web Programming with Python and JavaScript.
You can know it is free  by looking at the 'CS50 Certificate' section you can read that you only need to pay for the certificate but the course is Free.

* Update free-courses-en.md

Resubmitted the PR by changing the title as given by the resource.

* Update free-courses-en.md

Resubmit PR with the title as given by the resource: CS50’s Web Programming with Python and JavaScript.
Added in Alphabetical List.
Sorry,but it is my first PR so struggling a little bit.

* Update free-courses-en.md

Added Using Python for Research course from edX Harvard.

* Update free-courses-en.md

Link was not working so searched for the course and replaced it with new one.Same Course.

* Update free-courses-en.md

Added a new course 'CS50's Mobile App Development with React Native'

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

Adds the free 'Vue Router for Everyone' course on Vue.js from https://vueschool.io.

* Adds 'Internationalization with vue-i18n' course

Adds the free 'Internationalization with vue-i18n' course on Vue.js from https://vueschool.io

* Updated the Vue.js courses list to alphabetical order

* Added Persian Eloquent JS

Added the Persian translation of the Eloquent JS book

* Sorry, removed trailing slash

* Added the Arabic Eloquent JS

Added a link to the Arabic translation of Eloquent JS.

* Correcting the number of empty spaces

* Added JS + formatting for consistency

Worked on the JavaScript section:
-Capitalized the titles consistently
-Added info of authors and book types
-Removed Learned Code JavaScript by Playing a Game (not a book)
-Added the book "Designing Scalable JavaScript Applications".

* Tried to fix the build errors

* Reverted title name changes

* Update title
* Update location
* Order list

The url to the old location hosts an older version of the book(1996). GNU has the most recent version(2020) available in multiple formats. The title also changed: the original title is now a subtitle.

* Added sorting algorithm course by mycodeschool

* accepted suggestions
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Addded Hello SDL by LazyFoo

* removed the redundant part of the URL

* Added the Unity Manual

Updated free-courses-en.md with the official free manual from Unity

* Update free-courses-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Update free-courses-vi.md

* Update free-courses-vi.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* add bash shell

* Update free-courses-vi.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* add c free course

* Apply suggestions from code review
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Updated C++ Cheat Sheet

* Added C Cheat Sheet

* Add new course in Pt-Br (Python Fundamentos para Análise de Dados)

* Add new course in Pt-Br (Python Fundamentos para Análise de Dados)

* Add new podcast in Pt-Br (Data Hackers)

* Add new course of python in Pt-BR (Curso Python - Curso em Vídeo (YouTube)

* Update free-courses-pt_BR.md
Co-authored-by: NSeth <seth@elypia.org>

* Added new course of Python from Curso de Programação em Python from Prime Cursos do Brasil (YouTube)

* Added a new course Python (Programação em Python - Bóson Treinamentos)

* Added a new course Python (Programação em Python - Bóson Treinamentos)
Co-authored-by: NSeth <seth@elypia.org>

* add objective c

* Update free-courses-vi.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* Update free-programming-books.md

- Removed redirecting links for goalkicker.com
- Added links for some programming languages from goalkicker.com

* Update free-programming-books.md

Added tags to the links that are from GoalKicker.com

* add sql course

* add react free course

* Revert "add react free course"

This reverts commit 3607c3b935d508d55a3df69405ad28d1c8e8f3d1.

* Update free-courses-vi.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

* add free course vi

* Update free-courses-vi.md

* change the link of video to the playlist

* uupdate

* add pyqt books

* Update free-programming-books-ko.md

Add author and method of book

* Update free-programming-books-ko.md

* Beej's Guide to Network Programming - Using Internet Sockets

Added 9 translations:
Chinese
French
German
Italian
Korean
Brazilian Portuguese
Polish
Russian
Turkish

* Beej's Guide to Python Programming For Beginners

Added translations:
English

* Beej's Guide to Unix Interprocess Communication

Added Translations:
English

* Beej's Guide to C Programming

Adding formats.

* Beej's Guide to the GNU Debugger (GDB)

Added translations:
English
Russian

* Added translator names to the books.

Added Translator name for:
German
Italian
Polish
Brazilian Portuguese
Russian
Turkish
Chinese
No translator name found:
French
Korean

* Added author along with the translation!!

* Adding Free Python, Datamining, Machine Learning Books (Corrected Categories)

There were a few issues with my original PR (https://github.com/EbookFoundation/free-programming-books/pull/4866/files), so I forked the main respository and added my updates based on @eshellman 's feedback.

Edits include:
- moving "Top 10 Machine Learning Algos..." by Mathews and Aasim --> Machine Learning
- moving "A Select Overview of Deep Learning" by Fan, Ma, and Zhong --> Machine Learning
- adding "Natural Langauge NLP with Python Tutorial" --> Python
- moving "The Ultimate Guide to 12 Dimensionality Reduction Techniques" by Sharma --> Datamining

Note: there was a linter error coming up in the previous PR that I wasn't sure about (https://github.com/EbookFoundation/free-programming-books/pull/4866)....so hopefully this is all set!

* Update free-programming-books.md

Fixed the four errors coming up in TravisCI (adding extra line, and also some alphabetizing). Should be good to go now!

    445:1-455:191  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2

    445:1-455:191  warning  Alphabetical ordering: swap l.455 and l.454                            alphabetize-lists

    472:1-509:163  warning  Alphabetical ordering: swap l.506 and l.505                            alphabetize-lists

  2315:1-2408:101  warning  Alphabetical ordering: swap l.2362 and l.2361                          alphabetize-lists

* update free-programming-books.md

added Playtime with Hyperledger Composer book.

* update

* Added Python Crash Course Cheatsheet(#4952)

Added Python Crash Course Cheatsheet

* Update free-programming-cheatsheets.md