Don't trust companies/managers, specialize in tech that is not so obscure, and job hop.

I spent too much time in the company and that lead to a stagnate and boring career. I trusted them about having a long career and ended up learning obscure tech only to have my position outsourced (which they also said they never do). That obscure tech experience greatly limits my options to leave.

On a personal side, stay single and don't have a kid. Be able to retire early and do the things you want to do instead of the things you have to do.