New Mazda truck owner here

Hey all. I just bought an old beater to get to n from work. It's an 87 b2600. I also have a 68 mustang & have come to love the forums for their wealth of info. So I found this one and plan on asking a lot of dumb questions.

welcome to the scene!! dumb questions are welcomed here, just watch out for the answers!! lol

Ok dumb question #1 I'm not sure if because it's new to me

Shoot...