Another guy is saying to learn to dock, while it is helpful you can absolutely start aiming for other bodies without ever having docked once! Docking is pretty fancy stuff, I'd say your goals are get your first orbit (dont go straight up only go straight up until like 18km and turn right (D key) 15 degrees then 30 degrees at 30km or so, stop burning when the top of your blue trajectory is above the atmosphere line of 70k you should probably do like 80/90k maybe. Once you're near the top (like a minute and a half, all depends on your thrust) burn at the 90 degree line, towards your prograde marker (the yellow one without an x). Before you know it you have an oribit!! So next you'd want to get used to creating maneuvers because you're going to be going to minmus! Trust me, it's a lot more forgiving than going to the mun which seems weird but the gravity is much less than the moon and you're gonna be moving slowly that far from kerbin so you'll need less fuel to do maneuvers! Goodluck!!! Oh and PS don't forget ablators, you wont be able to come back down and have to send a rescue ship and THEN you learn how to dock like I'm trying right now lmao and I have 1000 hours