If you have 2k and want to turn it into 20k, over 5 years, what are realistic strategies?

I'm learning how the basics on managing money, but I don't know where to start. I'm trying to figure out the best strategy for starting at 2k to get a better turn out.

I would additionally, be adding $100 every month.

I looked into high yield savings accounts.

I don't know enough about CDs to understand it. However, that's something I can't access for a period of time. I don't want to go this route in case I have an emergency.

My goal is to get to 20k, but obviously more is great. :)

I am unsure if Fidelity is a good starting point? I feel like I don't understand enough to put my money here. But I am willing to learn more.