Okay, so I know i can add more space onto my laptop, but hpw do I do that? Could I go to a computer shop and ask them to do it for me?

Simple explanations please 😅 I tried looking it up but it honestly just flew right over my head. The site started talking about these different types of drives and I just don't get itttttt.
I want more room on my laptop so I can play sims, have my school work and work information on there 😅😅