Online marketing at 14

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Hi everyone, my name is Michael and I'm 14 years old. I'm here because I'm asking you guys on what I should do for online marketing. Yesterday I had an investor tell me that if I do marketing online people won't know that it's me. I was confused on what to do, and how this all works so here I am looking for your guidance. Do you guys have any recommendations on what I should do for online marketing? Also do you guys have any recommendations on how to learn all of this for free? Also I was wondering if doing this would teach me about real estate, would it? Or does it have nothing to do with real estate because right now I'm trying really hard to learn as much about real estate so that I'm prepared for my future. Anyways, thanks in advance for all of your advice and recommendations!