Folders are your best friend when projects get big. They work just like folders on your computer — organize everything and keep the chaos at bay.
Steps to use folders in the Project panel
Right-click in the Project panel and hit New Folder. Give it a clear name — “Music,” “Graphics,” “Footage,” whatever makes sense for what goes inside.

Click and drag files into the folder. They stay neatly grouped, but nothing changes in your timeline — they are purely for organization on your end.

You can nest folders inside each other too if you need multiple levels of organization.
One more thing
Keep a dedicated folder for Precomps. Once you have multiple compositions floating around, it saves you from confusion later.
Related how-tos
How to import video and images into After Effects
How to organize assets in the project panel in After Effects
How to set composition resolution, fps, and duration in After Effects
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