This is a collection of tips, tricks and observations for WordPress. I haven’t found these elsewhere. Most of these require you to modify your own theme and PHP files, so they are not for the absolute beginner or faint of heart.
Add a Topic page to WordPress
Do you want to have an introduction to a category of posts (or by a tag). Add a page template to your theme for topic pages.
Polylang language menu
How to create the language menu in the upper right corner using WordPress and Polylang?