a question

[deathgfx]

I have seen in many tutorials the use of anything called "exposure"
I saw my photoshop, I don't have it, I think
where do I get it or something?

[Derosion]

It's an adjustment, the icon is at the bottom of your layers panel.

[deathgfx]

I apparently don't have it, it may be for the version of photoshop

[Derosion]

I apparently don't have it, it may be for the version of photoshop

You most likely have Photoshop Elements. Sorry, can't help you.