* 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
* 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 PHP screencasts
* Correct the number of blank spaces
* Update free-podcasts-screencasts-pt_BR.md
* Alphabetical ordering
I didn't know all this rules to edit a file, my bad.
* Add Excel-vba Ebook repo.
* Add VBA Eboob Repo. and fix incorrect menu link.
* fix Wrong format line
* Fix incorrect markdown syntax.
* Refactor DB and Javascript menu ZH version md file.
Move 'MySQL, NoSQL, PostgreSQL' under menu: Language Agnostic(语言相关),
Delete a book link of [Google JSON 风格指南], it's a multiple repo. with [JSON 风格指南], 2 link is point to the same one page.
* Delete multiple ebook link
D1. [Redis 设计与实现](http://redisbook.com), wiich is the same as menu: NoSQL -> [Redis 设计与实现](http://redisbook.com)
D2. [The Little MongoDB Book 中文版](https://github.com/justinyhuang/the-little-mongodb-book-cn) wiich is the same as menu: NoSQL -> [The Little MongoDB Book](https://github.com/justinyhuang/the-little-mongodb-book-cn/blob/master/mongodb.md)
* Update comments description.
* remove multiple ebook link
* Fix machine chek issue(fix mistake link location of PostgreSQL)
* FIX machine checking [Do not use headings with similar content (544:1)]
* Fix machine checking [359:1-361:78 warning Alphabetical ordering: swap l.361 and l.360 alphabetize-lists]
* Update license warpping length to 80 characters.
* 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
LING_ZI_QING
Victor Λntonio
BSi
Sekito Lv
Ioannis Cherouvim
umanovskis
Dzmitry Lahoda
Ramiro Gómez
azzamsa
Duzij
Ted M. Young
Ramon
zhongjiajie
Atef Ben Ali
Tiago Athayde
Patrick Cozzi
cyril
ba230t
Desmond
Jesus Castello
ranwise
Medson Mendes
Dimosthenis Michailidis
Razor
Jeeva Subburaj
Prateek Kalra
Luis F. Uceta