How to spend less money? First, get an overview of what you're spending money on.
Reduce recurring expenses
Reduce random expenses
How to spend less money on food?
How to spend less money on clothes
If you wash your clothes a bit less (without smelling bad) they last longer. It's also a good idea to learn how to repair your clothes with a needle and thread. Again dumpster diving can be a great way to expand your wardrobe. Thrift stores are another very cheap way to find perfectly good clothes.