Synthetic Flying Machine

When I first started getting into orbit it seemed like everything was going well. I could almost make perfect circular orbits. Now it seems like no matter what I do whenever I make my maneuver node the amount of fuel it takes is way higher and the apoapsis and periapsis never seem to be similar. Here's a screenshot: Does anyone know a better way of getting into orbit? I was following Scott Manley's campaign tutorial.

Thanks for explaining the avatar and signature thing, haha! And I'll check out the tutorial. Thanks!

Hello, everyone! I'm the Synthetic Flying Machine and I'm new. I recently got back into Kerbal Space Program and just rocket science in general. I used to play it around a year ago just for fun. I wouldn't do anything but build random stuff and crash. I doubt I even got into space more than twice. But now that I've started playing it and actually gotten interested I've been trying to find good places to learn stuff about the game. I've learned how to get into orbit using maneuvers from Scott Manley's tutorials but his tutorials don't seem to really go in depth about things. It seems like he just expects you to know a lot of what he's talking about and me being the ultra beginner I am, don't I literally just before making this forum account started reading The Missing Manual Volume 1. I can't say much about it because I've read about 1 sentence but hopefully it explains things little farther. If anyone knows any other good tutorials that could help out someone that can barely make a good orbit, please reply with them. That would be greatly appreciated. Well thanks for reading