Thanks for your useful tips.
I'll try to do the best I can with the info I have.

Hi and thanks for all the info. I started mapping last September and am testing iD, JOSM, and Vespucci. But I've realized I have a lot to learn.

For now, I've modified this one: way/1436119280

I'm also trying to map the "chicken farm" further east, on the same road as "Cavallino Azzurro": way/1436282782#map=17/44.127703/12.424968

If I have time, I'll go mountain biking there this weekend. Maybe I'll have a flash of inspiration to map those places better.

Hi, you're right about the horse riding arena. But about the relation I don't know.
This place it's a mix of things that I found difficult to espress with iD presets.

"Cavallino Azzurro" it's an educational farm where they practice agritourism and hippotherapy.
It's in part similar to "Due Ponti Village" way/1375830220#map=17/44.153956/12.406633

So I don't think it's correct to map the place with a relation leisure=horse_riding.

I have a doubt about way/1436119280: a horse-walking area delimited by a wooden fence also used as a parking lot for cars. I mapped the lot with tourism=trail_riding_station. Is this okay?