Gmail has an interesting quirk where you can add a plus sign (+) after your Gmail address, and it’ll still get to your inbox. It’s called plus-addressing, and it essentially gives you an unlimited number of e-mail addresses to play with.
Here’s how it works: say your address is firstname.lastname@example.org, and you want to automatically label all work e-mails. Add a plus sign and a phrase to make it email@example.com and set up a filter to label it work (to access your filters go to Settings->Filters and create a filter for messages addressed to firstname.lastname@example.org. Then add the label work).