links - plugins and functions

1. Shortcode basics

2a. Functions file

2b. Functions file - useful code

3. Functions - WordPress builtins

4a. Plugins writing - basics

4b. Plugins writing - best practices

4b. Plugins writing - more

4c. Plugins writing - hooks using

4d. Plugins writing - hooks reference

coding - plugins and functions

video tutorials

More plugins_and_functions info on this site