Each character key on the keyboard is to input the character above the key. Those without characters (writing words) are special function keys.
Characters are for inputting characters. When typing, you just press it directly. If you want to know how to input quickly, you can check it. The keyboard has a standard way of doing it, but it doesn’t work without saying it.
Then there are special function keys, which generally involve combination keys, that is, pressing two or more keys at the same time will have a fixed effect.
This generally can be checked which button can do, it will not embarrass you. And the keyboard is generally divided into pc and apple, and their special function keys are different. Check it out for yourself, you may need to repeatedly check what it is for a period of time.