D.N.
Well, kids fall. And us moms watch and cringe but the kids pick themselves up and they are off again. When my kids were younger, I always put a nice thick comforter on the floor before letting them play. Let him explore things that are safe for him. My 4 yr old loved playing with an empty box and some blocks. He thought it was hilarious to dump everything out. And as he started walking, he had that lean forward gate kids can have and I swore he was going to trip as soon as he ran--my other kids too. Sometimes he did, sometimes he didn't. My kids have all had a ton of bumps, bruises and scrapes that go along with being a kid. We cannot bubble wrap them (thought it would be nice sometimes).
Just be there in case he does get hurt so you can take care of it.
I did look at your other posts. You need to have confidence on your self. Don't let others put a whole bunch of doubt in what and how you are doing in your head. Everyone has an opinion and it is how you take that opinion that counts.