The second tip for good credit and a solid financial future is:
Open a savings account and contribute to it regularly. One process I have followed is to open a savings account; build it to $1,000. Then buy a bank certificate of deposit with a higher interest rate. Rebuild savings to $1,000 and do again. An alternative to the bank certificates, depending on your age, would be to put the $1,000 into a broad based mutual fund; like Vanguard 500 or Russell 2000.