* Added new React books in Russian

* Alphabetized

* Removing Изучаем React

* Update free-courses-en.md

Added Flexbox & CSS Grid free video resources to the repo

* Update free-courses-en.md

* Update free-courses-en.md

Removed the trailing slashes from the root domain

Added one course link on machine learning topic

* Add Git & Github tutorial (screencast)

* Correcting number of blank lines and alphabetical order

* Adding new alphabetical order

* Improving order in alphabetical

* Solving issue with index (replacing with asterisks)

* Removing extra character to  C#

* Adding author to the resource

* Adding alphabetical order

* Added Open Source Reading Materials and Videos of Python for Everybody offered by Coursera

* Removed Coursera link and changed resource title

* Alphabetical ordering

* create HOWTO.pt_br.md

* add spaces and chage order

* add links to other HOWTOs

* add space

* add Portuguese HOWTO to the links

* add Portuguese HOWTO to the links

* add Portuguese HOWTO to the links

* add Portuguese HOWTO to the links

* correct file name

* correct link

* correct link

* correct link

* correct link

* Stanford Java course link

* put the new link alphabetically

* Add courses from metarhia organization

* Alphabetic order

* Add angular favorite resources from hacktoberfest 2019

* Add author first name and last name

* Add angular documentation in Russian

* Fix space between a new section and last link

* Remove wrong material
Co-authored-by: Nroman pedchenko <roman.pedchenko@dev-pro.net>

* add course about LaTeX (es)

* added markdown tutorial (es)

* fix issues with CI

AIcrowd enables data science experts and enthusiasts to collaboratively solve real-world problems, through challenges.

Co-authored-by: NSinSentido <sinsentido@localhost.localdomain>

Hogyan gondolkozz úgy, mint egy informatikus:Tanulás Python 3 segítségével python book added to list of Hungarian programming books. (#4381)

* Update free-programming-books.md

Added in 3 free programming books:
[Haskell Notes for Professionals](https://goalkicker.com/HaskellBook/) (PDF)
[Linux commands Notes for Professionals](https://goalkicker.com/LinuxBook/) (PDF)
[JavaScript Notes for Professionals](https://goalkicker.com/JavaScriptBook/) (PDF)

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

Add The Joy of Cryptography (2020) book to the mathematics section.

* Update free-programming-books.md

Add Haskell Notes for Professionals

* Update free-programming-books.md

Add Linux commands Notes for Professionals

* Update free-programming-books.md

Add JavaScript Notes for Professionals

* Update free-programming-books.md

* Added books.

* Removed a book.

* Added a book back.

* add tutorial java and spring framework in Indonesia courses

* add tutorial java and spring framework in Indonesia courses 2.0

* add tutorial java and spring framework in Indonesia courses 3.0

* fix alphabetize java courses

* add react native tutorial

* add author's name for react native course

* add a space line

* Update free-courses-pt_BR.md

* Update free-courses-pt_BR.md

Co-authored-by: NEunbee Kim <ekim105@myseneca.ca>

* [Initiation au PHP](http://framasoft.net/IMG/pdf/initiation_php.pdf) - David Ducrocq (PDF)

* Added assembly books.

* Removed duplicate books.

* Added a book.

* Update free-programming-books.md

* Added GDScript

* Update free-programming-playgrounds.md

* Add TH language books

* Add link on README.md

* Update free-programming-books-de.md

* Update free-programming-books-de.md

Removed the 0

* Update free-programming-books-de.md

* 20201018

* 20201018b

* [C - Programmering](http://synkro.dk/bog/c-programmering.pdf) - Henrik Kressner (PDF)

* [Praktické programování v C++](http://www.uamt.feec.vutbr.cz/~richter/vyuka/XPPC/spolecne/prednes.pdf) (PDF)
* [Think Stats: Pravděpodobnost a statistika pro programátory](http://eknihy.knihovna.cz/kniha/think-stats-pravdepodobnost-a-statistika-pro-programatory) - Allen B. Downey (PDF)

* [Microsoft Technologies 3, including books on Windows Azure, SharePoint, Visual Studio Guide, Windows phone development, ASP.net, etc. collection by Eric Ligman](https://blogs.msdn.microsoft.com/mssmallbiz/2017/07/11/largest-free-microsoft-ebook-giveaway-im-giving-away-millions-of-free-microsoft-ebooks-again-including-windows-10-office-365-office-2016-power-bi-azure-windows-8-1-office-2013-sharepo/)
* [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/) - Jason Brownlee
* [CS Unplugged: Computer Science without a computer](http://csunplugged.org/books/)
* [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)

* [Princeton Algorithms, Part 2](https://www.coursera.org/course/algs4partII)
* [Machine Learning Mini Bootcamp](https://lambdaschool.com/free-course-machine-learning/)

Links were down as of 10/17/20

* Added Laravel, Bootstrap into free-programming-books-zh.md

* Moved Bootstrap from single resource to HTML/CSS

* Added author to Bootstrap 4

* fix alphabetical ordering problem

* Learn Ruby

Added a Ruby online material for learning

* Formatting updated

I formatted the contribution by fixing the alphabetical order of my Learn Ruby tutorial.

Added in 1 free programming course:
* [Introdução ao Kubernetes no Azure](https://docs.microsoft.com/pt-br/learn/paths/intro-to-kubernetes-on-azure/)