You can't overwater in water! So you're good.
As an aside, my wife went to school for horticulture. Overwatering is exceptionally common. Whenever you feel like you should water a plant, skip that day and maybe even the next one.
Some plants even like to be drier and watering an amount that might be normal for another plant will kill it. You may want to consider getting a cheap hygrometer (or more than one) to test for moisture prior to watering.
For gaming, people often recommend Pop!_OS, Bazzite, or Zorin, but you can use whatever you want if you are a tinkerer. I use Debian and have a great time gaming.
Outside of gaming and if Windows software compatibility isn't really something you're worried about, you can use any distro you want.
You can try some of them out using a web browser with DistroSea if you feel like it, though they don't have every distro because that would be nuts.