If you want to make your game all time you need to create a new project for it.
- Firstly run unity engine.
- click on new
Project name : put here the name you want. (can be the name of your game).
Location : where you want put your game folder
Template: if you want make 2d game choose 2D or 3D if you want make 3d game.
- Click on create project Button
- Wait for a short time
Congratulation, this is the new project for your game
- This is the folder where you can find all files of your game.