The “label for=” and “id” tag must match, but you choose whatever word you want it to be.
Imagine someone visually impaired filling out your form. They can’t read what your different checkboxes are, but their screen reader reads out to them what all the options are. What does the screen reader read? Whatever word you input into the “label for=” element. So naturally, you want to make sure that whatever word you choose explains what the option is. That’s why you see in the exercise examples that the “label for=” attribute is the same as what will be displayed on the screen. So that the person using the screen reader receives the same information as the person looking at the screen.