I will recommend these links to know more about theme and plugin development.
Theme
Plugin
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This reply was modified 11 months, 3 weeks ago by
necafasu.
Most of the WordPress books that I’ve seen are fairly outdated. Your best bet to get into WordPress development is to read the specific handbooks and to experiment.
You can use WP CLI to scaffold a plugin, in that it sets up a lot of the core plugin files for you to be able to get a jump start on development.
WP CLI also has a scaffold feature for the _s (underscores theme) which is a Starter Theme from Auttomatic that provides a lot of the base code for you to work off of and begin styling.
As @necafasu said the theme and plugin developer handbooks will be your greatest asset.
I would recommend also looking into using PHP Code Sniffer and PHP Code Beautifier to help check that you’re following WordPress Coding Standards
Cheers guys, thanks for taking the time to reply!!