What languages and skills would I need to learn to build a simple game like tic tac toe or another simple game??

Question

What do I need to know to code a game?

Answer 1

You can make a simple game using HTML, CSS and JavaScript.
Learn C# for making games on Unity engine.
Learn C++ for making games on Unreal engine.

https://code.sololearn.com/Wukw9beaMo55/?ref=app

Answer 2

Any programming language should do.

You can browse the Code Playground for Tic Tac Toe projects (use the search bar) to see the variety of languages people have used to accomplish that.