links - plugins and functions
About using plugins, and making shortcodes, functions in functions.php, and plugins.
Shortcodes, functions, and plugins are all related, and progress from simpler (shortcodes) to more complex (plugins).
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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
More plugins_and_functions info on this site