Does minecraft cost money to play on a computer?

Nope it's absolutely free

Maybe… I remember back in the day I had to pay like $20 to have it…

The program itself is free to download, but you need an account to actually play it. I believe an account is somewhere in the range of $20-30.

Yes it does. The game itself costs $20, but there's no subscription or anything like that. It's just a one time fee to download the game and then you're forever set.

It's owned by microsoft, so of course you have to pay for it.

Five thousand dollars

Yes minecraft PC costs $26.95 USD (€19.95/£17.95).