This is literally a course assignment to get started.
Step 1: Add up your income and expenses for the past 3 months. (Income Expenses)/3 is what you keep. If you don’t like those numbers, spend less or make more.
Step 2: If you don’t have a cushy savings, set aside $1,000 to 3 months’ worth of expenses for emergencies. Put this savings in high yield savings account(s) (get close to 4% APY or more).
Step 3: If you have debts, prioritize paying them off. If you have no debts, prioritize retirement. If you have things you want to save up for (car, house, vacation, movie theater, sport tickets), slow down debt/retirement payments to save up for those things.
That’s the gist of it.