What do I need the tag <div> for?

I’m a beginner, please explain me simpy xD

what you don’t understand

I mean Why should I set the tag <div ? What gonna change?

Tag <div make block in your code

In simple terms:

<div> </div> tag is used to represent the division between the content.

It simply separates one content from another in HTML page.

You use div tags to group content, usually content that you want to visually group together.

HTML5 introduced a bunch of new tags like header, main and footer which people used to use div tags for to group the items together.