Hades' Star Guide

Welcome, new arrival!
After the tutorial has presented the most important options for action, the first questions arise - what now? What should I do here? How do I get rich? How do I subjugate my competitors and bread their faces with the dust of abandoned moons? What does this red button do there, with the inscription "Do not press at all"?
Of course, this guide can not and should not answer every question, not even every question about Hade's Star. But some of the more frequent ones should be taken care of.
Suggestions, how the guide can be extended, I accept gladly.