Well, a good thing to always do is save up some money, like put it in a jar or keep it somewhere that you'll remember so you can get back to it when you need money.
Also, try doing some jobs to make a little money such as dog or baby sitting, mowing lawns (not sure if ppl still do that.. but I know you can't down here in AZ bcuz its WAYY too hot lol), cleaning (like helping your parents clean, or maybe friends or close family friends and family members), etc.