If you want to learn all the selectors, I am currently working on updating my 7+ year old selectors talk at estelle.github.io/CSS/selectors/

If you want to learn specificity, check out speciFISHity.com, starring plankton, sharks and fish

Reminder: The “C” in “CSS” stands for “Cascade”.

It’s a feature. Not a bug.

Do me (yourself and the online world) a favor: learn HTML, CSS and JS before learning any frameworks. Thanks!