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.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/KwczeKdV2bs?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

NnSmartTooltip

 Very simple to use. Without shortcodes or anything else.

Great plugin

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

shawfactor

LH Dashboard Notes allow you to insert noes on your wp-admin dashboard for your users using the post editor interface. If this plugin is network activated the insertion and editing of these dashboard notes is centralised on the main site of your multisite install. Allowing you to set Dashboard notes that are viewed throughout your multisite network.

LH Dashboard Notes

Allows you to create and edit notes that appear on the admin dashboard

NnSmartTooltip vs LH Dashboard Notes