how to edit the hover part

Hi guys! I'm doing this for the sake of the peeps who don't know how to edit this and that.
I was worried that some of you don't know how to tweak this part and that.
So I'm going to start these tutorials for you <3
aaaand I'll start with Hover. What is hover and how do you do it?
so hover is when you put your cursor on an image, thing or text and there's a text that will appear c:

editing the hover:
first, you go to source and find the text or image with the thing you can hover over
you'll see something like this:
< i m g a l t = " " s r c = " https://45.media.tumblr.com/277aad03b7b020be68d6c9e47484ac4b/
tumblr_mk3wy3nTn21r1b6f8o1_400.gif " s t y l e = " width: 387px; height: 206px;" t i t l e="sup bruh" />
you'll see the "title part" and you'll just edit the text inside the quotation marks.
output:

hover over this text
and there you go! I guess that's all you need to know about hover c: