A tidy file system does not need dozens of folders. It needs a small number of places that make sense to you. Begin with practice documents, so you can explore copying and moving without worrying about an important original.
Choose a simple structure
Create a learning folder inside your usual documents location. Add a folder only when it helps you group related work. A name such as Practice letters tells you more than a string of numbers or a vague label such as Other.
Copy before experimenting
Copying creates another version; moving changes where the existing file lives. After either action, open the destination and check the result. If a service synchronises files across devices, deleting something may affect another device too.
Keep a separate backup
Saving a document and backing it up serve different purposes. A backup is a separate recoverable copy. Choose a suitable storage method, protect access to it, and occasionally open a harmless test file from the backup to check that it works.
Try this yourself
Create a practice note, copy it to a second folder and change the name of the copy.
Check your understanding
Can you identify the original and the copy, and explain where each one is stored?