Bachelors and Master Engineering majors transition

Hi everyone I’m deciding to get a bachelor in Mechanical Engineering and then a master in Aerospace Engineering. Is it ok? Is there any requirements?
Also, what is the major transition from bachelor to master, like: If I want to get a master in Mechanical degree, I have to get a bachelor in aerospace/mechanical? If someone draw out a flowmap that would be great. Thank you

Did you happen to look at any of the many other threads covering this topic?

really? I googled and couldn’t find it. Can you direct me to a good one?