When I first got orbiter, I would fly straight up in order to reach orbit. And then point downward to descend. I also did the whole point and fire thing with planets and moons.
"Oh look its Jupiter, let me go fire my engine at it for the next few days until I arrive."
I also would accelerate to really high speeds because I wasn't aware of time acceleration.
After I got the basics of Astrodynamics, I started to engage in disturbing military missions in which I would bomb bases on the moon and earth, attack orbiting vessels with missiles, and perform mock invasions of hostile territory on both mars and Ganymede.
Then I figured out how to make systems and I made about 20 of them. So now, I have a folder of all the stars within a 15 ly radius.