In Godot, you can create a sprite by either importing an existing image file, or creating a sprite using built-in tools.
To import an existing file to Godot, open the asset library by selecting "Assets" from the top navigation bar. Then, select "Import" from the bottom right. You'll be given options to import a single file or a folder from your device. Select the image file of your choice and press the "Import" button. The image file will then appear in the asset list.
To create a sprite with the built-in tools, select the "2D" tab from the top of the editor, then select "Sprite" and click "Create." You'll be taken to the sprite editing window. Here you can adjust many settings, including size and position of the sprite, as well as file size and other properties. Finally, click the "Save Sprite" button and it will be ready for use.
Hope this helps!