billizzard

It allows you to easily and easily create tooltips for words, phrases and in general for any content. 
The contents of the tips limits only your imagination. The appearance of the tips is very easy to customize as you need. 
The plugin is easier to use and more efficient than its counterparts. Requires at least ACF plugin 5.7.
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NnSmartTooltip

 Very simple to use. Without shortcodes or anything else.

Great plugin

Allows you to simply create tips with any content and any styles.

mansurahamed

iworksolo

Use the shortcode [private-user-notes] to any page or anywhere to turn it into a user private note page or section. Users will be able to add private notes there using a rich text editor. The notes are only visible to user himself as it’s private right! 
It also gives user option to print their private notes with a single click.
This could be really useful for membership sites where you might want users to be able to save private note in any page,tab or their profile.
Admin can control who can use this feature and be able to save private note. It provides a plugin settings page under Settings inside dashboard where access settings will be found.
Official Developer: <a href="https://www.fiverr.com/mansurahamed706" rel="nofollow ugc">Mansur Ahamed</a>

Private User Notes

Perfect for my need!

It works!

User-private frontend notes: save, edit, print. Restrict by role/user.

NnSmartTooltip vs Private User Notes