I wanna make my own computer also

I want to make my own computer

So i want to make my own computer, with the green PCB board and a small screen with big pixels thing, this was very hard for me to do, so i asked ia on how to do it, and ia wont give me a clear answer so i am now here, my programming expertise?

\\# When i started programming:

\\\*\\\*2023\\\*\\\*

\\# What i started with:

\\\*\\\*Roblox lua\\\*\\\*

\\# What i am doing now:

\\\*\\\*Python\\\*\\\*

Ive actually genuinely mastered roblox studio, i plan to make a trench war game and ive already modeled like 5 weapons for the game, i plan to initiate development of the game in summer since my finals are about start, so i want to program my own computer, with a green PCB board and a small screen with big pixels, with python specifically, i also plan to make my own computer also in summer since ill have lots of time and no school

Whats the best PCB board to buy thats also very cheap including a screen, thats cheap and very pixelated,

, not a high quality screen, and i wanna program it with python

So if there are any hardware engineers in this subreddit, pls comment down below

\# (Also it wants me to add a link so i js linked my roblox account)