Keeping things organised
These files are stored on your computer, so it is a good idea to store them in well named places and give them descriptive names so that they can be easily found when needed.
You can group files together by placing them in folders, and you can put as many folder in a folder as you like.
A way in which you could visualise the way a computer stores files is by thinking of a tree.
Each trunk or branch being a folder, with the leaves at the end of the branches being the files, just like the accompanying image.