Does it matter what Apple mac i get?

When buying an iPhone or iPad it usually matters what gen you get as older versions don't support certain apps etc is it the same with an Apple mac or does it not matter what one i get?

My dad has done a lot of messed up stuff to me and my family in the past and last year he leased an iPhone for me on his?

Phone plan But I'd much rather give him his phone back cus I don't want it I don't want any more I don't want anything to do with him honestly but I know it would probably cost a few hundred dollars just to break the contract and he wants me to pay for my own cell phone bill once I turn 18 and I turn 18 this month and once i give it back I might go on my moms phone plan i don't know yet and like for example one of the messed up things he did to my mom was he claimed me on taxes illegally cus he told IRS that I was with him for most of the year when I really wasn't I lived with my mom up until like September because I moved in with him last year btw big mistake and what my mom told me was he basically claimed me he called my mom and said hey I just claimed our son and she was like Why would you do that and he was like well too Bad I already claimed him and I can't stand selfish people like him and he actually makes way more money then my mom does so do you understand why I want nothing to do with him? And yes she is getting a refund but still it's the principal like maybe my mom needed that money for something really important you know so yeah and can he sue me for giving his phone back or? Cus it technically is he has said many times that it's his phone

Setting/app that automatically turns off your iPhone at specific times?

I've been having a bad problem lately of not being able to put my phone down before bed. I keep accidentally staying up till 1:00 am and I need to stop doing that. The problem is even when I use the downtime setting or that dumb clock timer trick it doesn't work cause it's to easy to ignore. I need something that'll turn my phone completely off so I can't use it at all. Anyone know of anything like that?