Building game tree

HI, I was wondering if someone can give an example in words for a simple game so that I can practice building the game tree to find best moves for a minimax algorithm. Online sources only show the game tree, but I want to build it from scratch if someone can put up a simple eg that be great. I want to get better understanding before diving into implementing minimax algorithm on my own.

Tic-Tac-Toe is a pretty traditional game to use as an intro to minimax. You can get more complicated by making it bigger than 3x3 or even 3-dimensional.

After that, you can move on to checkers (or Kōnane, which is Hawaiian checkers, or Chinese Checkers) and eventually chess.