Selective Sync is a helpful Dropbox feature that lets you choose which folder you'd like synced with your computer and which you'd like stored only online. You'll still be able to access all of your data from the Dropbox website when you need to, but now you'll have some extra room on your computer's hard drive. For more info, check out: Selective Sync in the Dropbox Guide and Saving Hard Drive Space with Dropbox.
How does Selective Sync help your workflows? Do you have any related advice for new people using Dropbox?
Also, feel free to ask questions about Selective Sync and we'll be happy to help!