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.

cartpauj

This plugin adds a text editor area to each User Profile in the dashboard for Administrators to keep private notes about each User. The notes are ONLY visible to Administrators — that’s the whole point! It also adds a column to the “All Users” list where you can quickly see the note for the user without having to even open their profile.
It is especially handy for <a href="http://www.memberpress.com/?aff=20" title="Best membership plugin for WordPress" rel="nofollow ugc">Membership Sites</a> where you may have thousands of members to deal with and need to remember special circumstances for them.

User Notes

When you're running a Membership Software on top of WordPress and have a team of admins managing thousands of users you can lose track of what's going on with some users pretty fast. This plugin makes it dead simple to keep an internal file on people so you can see previous admin notes about them. Very important to a well functioning business.



Straight forward and super effective

Keep private notes about each of your users that only Administrators can see.

NnSmartTooltip vs User Notes