What are some entry level marketing services I can offer as a beginner?

I'm interested in starting a "side hustle". I want to help other people promote their businesses and I think many people just want to work on their business and not have to deal with marketing. However I'm learning so I would prefer to do entry level tasks and not do things that are "Mission Critical"? For example working at a restaurant, I dont want to be the Chef because my skills aren't there (yet), but I can certainly slice onions and potatoes all day to get my foot in the door. Ok maybe that's a bad analogy but I think it describes how I feel. What are some more admin-tasks I can do as a beginner that will really help some companies out and I can learn? I've been using computers & Facebook for years and comfortable around them. I just dont know what to put on my website as services offered.