Welcome to the space faggots general. Here we discuss space travel news, theory and experiments.
Resources:
Classes of satellite orbits: https://youtube.com/watch?v=PZAkiXNJIqc

The most confusing things about orbits: https://youtube.com/watch?v=i5XPFjqPLik

How gravity assists work: https://youtube.com/watch?v=16jr7WWGSxo

Kinds of rocket engines (aerospike not included): https://youtube.com/watch?v=LbH1ZDImaI8

Other forums:
https://forum.nasaspaceflight.com/