A tooltip that follows the cursor. How to setup?

Question

CMS

In general, I learned to create a template on Joomla. I did everything according to the instructions of the uncle from the Internet: I wrote a simple site, made a template out of it, installed it on Joom - it all worked. Began to check the resulting for the presence of contingencies.
When I clicked on the link "Forgot your login (password)?" - in the page that opened, I was waiting for an incomprehensible tooltip that moves behind the cursor when hovering over "Email address *"

(it moves when the cursor moves)
I tried to solve the problem myself.
I rummaged through the Joomla folders / files - I found where the variable with the text of the pop-up message is stored, found out that it seems to be called description , along the way I learned PHP, but here is where the css-file is stored, which is responsible for the appearance of this pop-up shnyaga- the couple did not find
QUESTIONS:
1. Actually, how to set up the style of the shnyaga described above and where is it generally stored?
2. Can anyone advise a normal site on the insides of Joomla? Telling how it works, how to work with module codes, etc. Otherwise, I only come across video tutorials for degenerates.
ps
Do not just water me for using Joomla. I've been doing all this not so long ago and I'm still young :D

Answer 1

You, of course, excuse me, but the style of your question is rubbish. Where did you learn to communicate like that on normal resources? Or is this your official style?
For your question, here is a nice tooltip plug-in that can follow the mouse out of the box http://qtip2.com