This is a good time to save your work. In order to remain organized, let's create a Scenes folder under Assets. Here are the steps to accomplish that:
- In the Project panel, click the Assets folder.
- In the right-hand section, right-click and select Create | Folder. Name the folder Scenes.
Now you are ready to save your work. From the top menu, select File | Save Project. You can use the File | Save Scenes or File | Save Scene As... option to save your scene. Also, when you exit without having saved your scene, you will be prompted for a name. Save your scene using any of those options, give your scene the name of Main and ensure it is saved in the Assets | Scenes folder.