These recommendations might help you when organizing your course materials using folders.
Keep Your File Structure Simple
You can use any file structure you want to, but a simple folder structure using top-level folders helps you to more easily find what you are looking for.
For example, if you create a folder hierarchy that contains many subfolders, you might have a more difficult time locating a certain image than you would if it was in a top-level folder with a descriptive folder name.
Use Descriptive Folder and File Names
When you are naming folders and files, it is always best to use the most descriptive name you can so you can easily locate a file in a folder.
Don't Give Hints
Avoid using file names that might provide a hint or an answer to a question, such as correct.png.