If you want to learn to make a game you have to start small. Pick a programming language to learn, lets say C or python, or java or C#. Then after learning the basics of it, start making text-mode games like guess the number. Then learn how object oriented programming works and make more games with it, and then learn how to create GUI programs and make tic-tac-toe or tetris style games. And learn how to use API’s in your programs to extend the functionality… maybe make a networked version of tic-tac-toe?
The creation of assets for a game like animated models, or the game levels, is a whole other ball of wax. You can buy those assets to make a game with, but the reverse is not true. you can’t go out and buy some code for a game, you’d have to hire a programmer.
Saving data to a server? Use an api for that… learn how to use api calls. Take a couple programming classes at a community college and learn about it. How can you have gone 13 years and taken dozens of classes and not know how to do anything?