Security testing

https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project

https://www.owasp.org/index.php/OWASP_Guide_Project

https://www.owasp.org/index.php/OWASP_Cheat_Sheet_Series

Testing

http://www.satisfice.com/blog/

http://kaner.com/

http://www.developsense.com/

https://en.wikipedia.org/wiki/Software_testing

http://www.testingeducation.org/BBST/

http://www.softwaretestingclub.com/

https://www.stickyminds.com/

https://phpunit.de/

https://github.com/simpletest/simpletest

http://xunitpatterns.com/

https://martinfowler.com/bliki/UnitTest.html

https://martinfowler.com/articles/mocksArentStubs.html

Coding standards

https://www.drupal.org/docs/develop/standards/coding-standards

https://github.com/djoos/Symfony2-coding-standard

http://symfony.com/doc/current/contributing/code/standards.html

https://www.tiobe.com/static-code-checkers-survey/

https://www.javacodegeeks.com/2012/10/java-code-quality-tools-overview.html

https://en.wikipedia.org/wiki/List_of_tools_for_static_code_analysis

http://www.icsharpcode.net/TechNotes/Commenting20020413.pdf

https://www.thoughtworks.com/continuous-delivery

https://www.thoughtworks.com/continuous-integration

https://confluence.atlassian.com/crucible/using-crucible-298977437.html

https://saltstack.com/

https://gerrit-documentation.storage.googleapis.com/Documentation/2.11/index.html

https://gerrit-documentation.storage.googleapis.com/Documentation/2.11/intro-quick.html

https://git-scm.com/book/en/v2

https://try.github.io/levels/1/challenges/1

http://learngitbranching.js.org/

https://www.gerritcodereview.com/

Trunk Based Development
https://www.thoughtworks.com/insights/blog/enabling-trunk-based-development-deployment-pipelines

Centralized Workflow
https://www.atlassian.com/git/tutorials/comparing-workflows#centralized-workflow

Gitflow Workflow
https://www.atlassian.com/git/tutorials/comparing-workflows#gitflow-workflow

GitHub Flow
https://guides.github.com/introduction/flow/

https://trunkbaseddevelopment.com/