What to eat on a trek?

Are you going on a trip to the mountains and wondering what you will need to take with you? In addition to appropriate clothing, you must also think about food. This should satisfy you and everyone else you are going out with, its preparation should be quick, but at the same time it must not take up a lot of space in your backpack and be too heavy. So what to take with you?
Food is the basis of every expedition
What are we going to talk about, without food on any trek...