I've been playing KSP for long time, some things I've learned.
1 When you build your rocket, you'll forget something, put something in the wrong place, or generally foul it all up. Revert is your friend when you 1st start. Build your planned rocket and if you have revert Launch it and TEST IT without going anywhere other then orbit.
2 The only way to learn to land on airless moons/planets is to learn how not to crash, practice.
3 The fact that you fouled up and stranded a Kerbal somewhere is not the end. Its a new mission!!! We have to bring him home!! Less its Eve, then he's screwed. Least he can plant flags for Money.
4 Explosions...are very cool.
5 I can't fly a Space Plane worth anything. Which is odd, given how much I love flight sims.
6 Thank you to all Modders.
7 Its a game, if you're not having fun, find something else to do.
8 Its rocket science, its not supposed to be easy.