So far everything has been quite clearly positive or negative to your finances. Money in the bank earning interest gis helpful. Paying off the interest on a mortgage is not helpful (though buying the house can be good over the long-term!)
Credit cards are a different story. They are either positive for your finances, or a very big negative. And the exact same card can be either, depending upon how you use it.
If you’re in High School, you may not need this information for a little while: Unless you prove you have income, you can’t get your own credit card until you turn 21.
[Read more…] about Financial Literacy #7: Introduction to Credit Cards