Once you have added some assets into the Asset Library, it is time to start organizing them into folders. New folders can be created by clicking on the button at the top of the library, which will open up a modal to give your folder a name. Once in the folder, you can also add sub-folders for more structure.

To move assets into a folder, just bulk-select the assets and then click on the "move to a folder" button in the bottom menu.

To move a folder into another folder, just navigate into the folder and click on the "move folder" button on the top right.