Best way to show more info, Tooltip vs no tooltip?

1. When should you not use tooltip?
2. What can I use instead of a tooltip?
3. Should tooltips have full stops?
4. Should buttons have tooltips?

When should you not use tooltip?

1. Don't use tooltips for information that is vital to task completion. Users shouldn't need to find a tooltip in order to complete their task.

What can I use instead of a tooltip?

You can use modals, hotspots, and in-app messages to replace tooltips.

Should tooltips have full stops?

Periods and Other Terminal Punctuation

In general, do not use punctuation at the end of a headline, button label, checkbox or radio button label, tooltip, text link (unless the link ends a sentence), or navigation element.

Should buttons have tooltips?

If you're introducing the button as a new element & needs to draw users' attention you should use tooltip. It will help users to learn. *If the button explains itself clearly, we should not use tooltip.