Metaboxes
- Use a variable length array to create (and save) checkboxes in a metabox? WordPress StackExchange.
Custom Tables
- Craig Schlegel. Pros and Cons of Using Custom Tables in WordPress. 2018.
Admin
- Tom McFarlin. How To Save WordPress Submenu Page Options. 2015.
Landing Pages
- Tom Ewer’s How to Build a Landing Page (WPExplorer, 2014-2016)
- Tom instructs us to create a template file called front-page.php. This is too specific imho, I prefer blank.php (very wide) or landing.php (specifically landing).