Relax!! I’m not trying to say you won’t make a mistake I’m just trying to say that if you accidently pass that much voltage it won’t make a difference if you have a hard soldered board or a user replaceable board, the whole board will be fired not just the processor, so clones are cheaper then the real thing and do just as well so I’m just suggesting buying clones.
God knows how many times I’ve fried something, just trying to save you some bucks, you might want to go the standalone route where you just buy a pre-bootloaded chip and plop it in a bread board, there’s not much to wire up and could really save if you make a mistake, you can literally wire up a working breadboard arduino in like 5 mins downside is you need a usb to serial board, but there cheap and once you have it you can use it on so many different arduinos
Please don’t take any offense, you can buy any clone you want I myself have a real arduino board, 2 seeeduinos, a RBBB (real bare bones board), a couple of chips that i just breadboard and a design I made my own.