I dont know if this is the right place to ask it, but I will go:

Sometimes I see job offers that ask for experience with large websites, large databases, large servers, etc, etc, etc (you get the idea).

How do you land those jobs if getting in that kind of subject is impossible alone? You can't simulate that kind of things at your home, so unless your side project grow and you must learnt it the hard way, or you had luck to be at a company where they allowed you to be involved, how do you learn that? Thank you