* Add a free JS resource on the list of free JS books.

* Alphabetical orderFix

"let's" > "leaflet"

* orderFix with eyes wide open.

T > A.

there were only links to v1.x django docs, so I added a link to the django 2.2 pdf docs

url = https://buildmedia.readthedocs.org/media/pdf/django/2.2.x/django.pdf

* added C Programming Language book PDF source

with reference to issues [3189](https://github.com/EbookFoundation/free-programming-books/issues/3189)
Added C Programming current standard PDF source.

* Add PDF indication

* Update deprecated links to Google's Android courses

* Renaming link to codelab in alphabetical order

* Rearrange in alphabetical order

* Remove Android Developer Fundamentals from books

* Add Android Developer Fundamentals to courses list

* Adding Harvard GSE Scratch Book

* adding raspberry pi press book

* spelling sorting doesn't ignore "an" as first word of title

* add introduction to Ada course book

* Change book to add

Add Ada for the C++ or Java Developer book instead.

* add author name to an ada book

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

Sorry for the error, fixed the spaces so that the linting will now work.

* Learn Azure in a Month of Lunches Book Added

* Learn Azure in a Month of Lunches Book Added

* Author Added

* IPv6 for IPv4 Experts english has been added

* IPv6 for IPv4 Experts russian has been added

* IPv6 for IPv4 Experts russian URL change

* IPv6 for IPv4 Experts english URL change

* Removed non-working book link

The link gets redirected to www.oreilly.com. The 1st chapter is still available to read online at https://www.oreilly.com/library/view/python-cookbook-3rd/9781449357337/ch01.html

* Removed another redirected book

The URL is redirected to http://jasonrbriggs.com/python-for-kids/ which is not available for free.

* book update

* Removing non-free book

* Add link to WebGL Insights book

* delint - spaces and trailing slash

* remove 2 ebook of [Linkers and Loaders], [Learn Python The Hard Way]. ref issue:#3091, #3062

* Fix Issue: #2993, Add book The Black Art of Programming.

* fix author name

remove 2 ebook of [Linkers and Loaders], [Learn Python The Hard Way]. ref issue:#3091, #3062 (#3104)

* Add Ruby Tutorial For Beginners

Hi,
This adds a new free Ruby tutorial (HTML version), **optionally** visitors can download a PDF version of the book by entering an email address.

## What does this PR do?

Add Resource

### Description

Free Ruby tutorial / book for beginners in HTML format with multiple lessons, including installing Ruby, conditionals, loops & object-oriented programming.

### Why is this valuable

It's a complete Ruby tutorial for beginners that helps learn Ruby from scratch. Includes examples, clear explanations & exercises.

### How do we know it's really free?

I made it.

### For book lists, is it a book?

Yes.

### Checklist:

- [x] Not a duplicate
- [x] Included author(s) if appropriate
- [x] Lists are in alphabetical order
- [x] Needed indications added (PDF, access notes, under construction)

* Use Full Book Name

* add CSS Animation 101 ebook

https://github.com/cssanimation/css-animation-101

* Update free-programming-books.md

* Update free-programming-books-es.md

Add Piensa en Perl 6 (Spanish translation of Think Perl 6)

* Update free-programming-books.md

Add another Perl 6 book. Nowadays Perl 6 is also known as Raku (https://marketing.perl6.org/id/1541379592/pdf_digital) and the name Rakudo refers to the only major Perl 6 compiler at the moment. Also update status of 'Using Perl 6'.

* Update free-programming-books.md

Alphabetize list

* add space to satisfy linter

* Update free-programming-books-es.md

* Adding Cuda PDFs

* putting alphabetically order

* removed extra space

Always check the output of the linter!

* Add Excel-vba Ebook repo.

* Add VBA Eboob Repo. and fix incorrect menu link.

* fix Wrong format line

* Fix incorrect markdown syntax.

* Add "Programming Language Foundations in Agda"

New book out from Philip Wadler and Wen Kokke.

Site: https://plfa.github.io
Repo: https://github.com/plfa/plfa.github.io

* Add authors' names

* remove trailing slash, add full names

* Link directly to O'Really PDFs

O'Reilly has been changing up some of these links, redirecting you to a rather scarce hub.
But they are still hosting the files.

This change is justified by the file still being publicly hosted.

* Fix annotation for linter

* I guess the linter wants PDF capitalized

* Add Computer Networks: A Systems Approach

* Add authors

* Fix format

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* Revert 3021 master (#3025)

* Revert "remove dead link from free-programming-books-tr.md (#3024)"

This reverts commit 0f07297a.

* Revert "Added Git and Github course (#3023)"

This reverts commit 3e9e1ded.

* Revert "Added resources (#3022)"

This reverts commit 500db345.

* Revert "issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde (#3021)"

This reverts commit 27982680.

* remove space, readd javajavajava

* issues:add in list #3009,#3010, correction blank in #3011

added:
Object-oriented Programming in JavaTM Textbook by Rick Halterman #3009
Introduction to Computer Science by Robert Sedgewick and Kevin Wayne. #3010
corrected:
link not displayed correctly(displayed with makdown)
deleted blanc ...Problem Solving] (https://archive.... in Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde #3011

* issues:add in list #3009,#3010, correction blank in #3011

added:
Object-oriented Programming in JavaTM Textbook by Rick Halterman #3009
Introduction to Computer Science by Robert Sedgewick and Kevin Wayne. #3010
corrected:
link not displayed correctly(displayed with makdown)
deleted blanc ...Problem Solving] (https://archive.... in Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde #3011

* add 2 books, create [Eiffel](#eiffel),

add
Programming Languages:Theory and Practice - Robert Harper,
A Functional Pattern System for Object - Oriented Design-Thomas Kuhne,
Object Oriented Programming using Java - Simon Kendal

corrections
The Definition of Standard ML (Revised) - SMLFamily GitHub project
Programming Languages: Application and Interpretation (2nd Edition) - Shriram Krishn

* add 2 books, create [Eiffel](#eiffel),

add
Programming Languages:Theory and Practice - Robert Harper,
A Functional Pattern System for Object - Oriented Design-Thomas Kuhne,
Object Oriented Programming using Java - Simon Kendal

corrections
The Definition of Standard ML (Revised) - SMLFamily GitHub project
Programming Languages: Application and Interpretation (2nd Edition) - Shriram Krishn

* swap l.1413 and l.1412%B

swap l.1414 and l.1413%B Line 1414: oriented --> Oriented%B some corrections thanks to eshellman%B correct add one blankline  before ### Subversion%B

* issues:add in list #3009,#3010, correction blank in #3011 (#3026)

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* Revert 3021 master (#3025)

* Revert "remove dead link from free-programming-books-tr.md (#3024)"

This reverts commit 0f07297a.

* Revert "Added Git and Github course (#3023)"

This reverts commit 3e9e1ded.

* Revert "Added resources (#3022)"

This reverts commit 500db345.

* Revert "issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde (#3021)"

This reverts commit 27982680.

* remove space, readd javajavajava

* issues:add in list #3009,#3010, correction blank in #3011

added:
Object-oriented Programming in JavaTM Textbook by Rick Halterman #3009
Introduction to Computer Science by Robert Sedgewick and Kevin Wayne. #3010
corrected:
link not displayed correctly(displayed with makdown)
deleted blanc ...Problem Solving] (https://archive.... in Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde #3011

* issue #3011 Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde

* add 2 books, create [Eiffel](#eiffel),

add
Programming Languages:Theory and Practice - Robert Harper,
A Functional Pattern System for Object - Oriented Design-Thomas Kuhne,
Object Oriented Programming using Java - Simon Kendal

corrections
The Definition of Standard ML (Revised) - SMLFamily GitHub project
Programming Languages: Application and Interpretation (2nd Edition) - Shriram Krishn

* swap l.1413 and l.1412%B

swap l.1414 and l.1413%B Line 1414: oriented --> Oriented%B some corrections thanks to eshellman%B correct add one blankline  before ### Subversion%B

* added clarification to title so folks don't think it's the book.

* A MACHINE MADE THIS BOOK ten sketches of computer science by JOHN WHITINGTON (PDF)

* Computer ScienceI, Computer ScienceII, Computer ScienceIII, Searching & Sorting, Trees, Cryptography & Security, Intoduction to Git and Github - Tutorial

by Dr. Chris Bourke (PDF)

* issues:add in list #3009,#3010, correction blank in #3011

added:
Object-oriented Programming in JavaTM Textbook by Rick Halterman #3009
Introduction to Computer Science by Robert Sedgewick and Kevin Wayne. #3010
corrected:
link not displayed correctly(displayed with makdown)
deleted blanc ...Problem Solving] (https://archive.... in Java, Java, Java Object-Oriented Problem Solving by R. Morelli and R.Walde #3011

* add 2 books, create [Eiffel](#eiffel),

add
Programming Languages:Theory and Practice - Robert Harper,
A Functional Pattern System for Object - Oriented Design-Thomas Kuhne,
Object Oriented Programming using Java - Simon Kendal

corrections
The Definition of Standard ML (Revised) - SMLFamily GitHub project
Programming Languages: Application and Interpretation (2nd Edition) - Shriram Krishn

* feat: delete Bourke's Lectures. closes #3050

squash 4 commits (git reset --soft HEAD~4)
delete Trees - Lecture notes because in CS III (git commit --amend)
add (🚧 *in process*) in CS I II III
edit comment aqyash->squash (git commit --amend)
l.1428 and l.1427, delete 2nd double Object Oriented Programming using Java - Kendal
swap l.1429 and l.1428
swap l.1427 and l.1426, delete double Halterman, l.1429 and l.1428, add (PDF)in Pecinovsky
swap l.366 and l.365, l.694 and l.693, l.1428 and l.1427

* added Solidity

* added Solidity

* added Solidity

* bitcoin book added

* fixed ordering on bitcoin book entry

* added authors for bitcoin and solidity books

* added Bitcoin and cryptocurrency Princeton book

* elm interactive playground added (ellie)

* free elm books added

* elm podcast added

* corrected spacing

* reordered elm books into existing category

* reordered format and author

* removed trailing /s

* fixed alphabetical ordering

Free in the github repo, and also available as a hard copy for purchase.