How to make another GUI appear when mouse in on other GUI

Introduction

I know the title is a bit confusing, but, I will explain my doubt, well, I’m creating a game that will have a start screen (with buttons and play, settings and others);

The Question

But, with each button, if the mouse just passes over, it will appear another GUI on the side, like those blue wikipedia texts, how do I do that?

Sorry for my grammar and my explanation, it can be confusing but I really need help, any help is appreciated.

You’d use the function:

script.Parent.MouseEnter:connect(function()
–Do something
end)

Thank you so much!

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