Is it better to use i or ? for tooltip/help content on mobile [duplicate]

1. When should you not use tooltip?
2. Do tooltips work on mobile?
3. What is the best tooltip placement?
4. What is the best practice for tooltip length?

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.

Do tooltips work on mobile?

Tooltips aren't just for web—they're one of the most popular and effective UI patterns for mobile apps, too.

What is the best tooltip placement?

Tooltip placement

Tooltips should always be placed near the UI element that they are describing, usually opposite the little arrow. Of course, “near” doesn't mean that your tooltip should obscure the element it's supposed to be helping your customer understand.

What is the best practice for tooltip length?

A tooltip text should be short, no longer than 140 characters. However, the length of the text can also depend on the positioning of the tooltip.