These licenses are GPL GPL GPL is an acronym for GNU Public License.

Compatibility chart for GPL v2, v3 and LGPL.

Proper Copyright/License Attribution for Themes.

February 2017: Hooks (Actions and Filters).

January 2017: Tools for reviewing themes: Local environments and testing tools.

December 2016: Enqueuing scripts and stylesheets within WordPress and better practices for themes.

November 2016: Translation for themes and repo guidelines.

October 2016: Talking about escaping, validation and a few other things.

Moving to the Customizer API from the Settings API, using Options API by Chip Bennett.

Customizer tutorials and documentation by Justin Tadlock.

coding standards as published in the WordPress Coding Standards Handbook.May also refer to The collection of PHP_CodeSniffer rules (sniffs) used to format and validate PHP code developed for WordPress according to the PHP coding standards.

List of functions that are escaped, from the WordPress Coding standards WordPress Coding Standards The Accessibility, PHP, JavaScript, CSS, HTML, etc.

When And How To Escape Core Functions In WPORG Themes by Milana Cap.

A Guide to Writing Secure Themes – Part 4: Securing Post Meta by Fränk Klein.

A Guide to Writing Secure Themes – Part 3: Sanitization by Fränk Klein.A Guide to Writing Secure Themes – Part 2: Validation by Fränk Klein.A Guide to Writing Secure Themes – Part 1: Introduction by Fränk Klein.

Custom CSS boxes in themes by Justin Tadlock.Using Sane Defaults in Themes by Chip Bennett.Most Common Admin Review Issues by Emil Uzelac.Prefix all the things by Justin Tadlock.

Preliminary Theme Review Process by Emil Uzelac.A Guide to Reviewing Themes for the WordPress Theme Repository by Chip Bennett.GPL-Compatible Icon Sets Keyboard navigation.

Flat free wordpress theme 2017