Finance isn't complicated (but it may be difficult). Here's the basic outline:
Don't buy anything you can't afford. Don't buy a house if you can't afford it. Scrutinize all purchases. (This is what makes this difficult, even if it's simple.)
Your employer probably offers a match on contributions to a 401(k)/403(b). Contribute to these funds up until you maximize this match (it's free money). Buy only low-cost index funds and hold them forever.
Pay off all debts except your house. Pay off credit cards monthly.
Save 6 months of living expenses (how much money you'd need if you lost your job for 6 months) and don't touch it.