Yes, as soon as you have a regular paycheck you should start building an emergency fund. This should be taught to everyone in high school (or earlier) but we don't do it, among many other "life skills" that we do not teach because they aren't on the state standardized tests.
I had 6 months saved . It's been 13 months. School did not prepare me for the fact that my college degree in STEM could still leave me on the market for an entire caledar year