https://frontendmasters.com/blog/perfectly-pointed-tooltips-a-foundation/

https://frontendmasters.com/blog/perfectly-pointed-tooltips-all-four-sides/

System Design Example

Interesting questions to answer

How to open multiple tooltips with only hovering one.

How to open a tooltip with hovering another element unrelated to the anchor one.

How to manage the tooltip not having enough space. (check article on top of page for this)