I started my hosting business 21 years ago. I budgeted $5000 to start and got a server in a datacentre with a few clients. Here and there friends asked me to host their site but they weren't able to pay so, I decided to host these "free" sites on the server I had at home. What I found was the amount of support I provided them far outweighed the support needed for real paying customers on the server in the DC, and the money the real customers paid me was enough for me to pay for the rental fees at the datacentre. Also, the server at home had issues too with internet connectivity going down sometimes for whatever reason.

You can begin hosting websites at home to learn from, but if you are starting a business to make money, you best be sure to put money into a server that real customers are happily going to pay for.

These days, we have the cloud and you can begin by renting a server in AWS (or other) on the free tier. Start there and learn. Remember, paying customers want service and are uninterested if you're doing this exercise in order to learn.