Cash back on gas, groceries, and restaurants just for claiming an offer in the app before you pay. New users get 10% back on their next restaurant or grocery offer and 15¢/gal on their next fuel fill-up. Stacks on top of whatever your credit card already earns. Takes about 30 seconds to set up — download, claim an offer near you, pay like normal. The gas cash back is where it actually adds up if you're filling up regularly.

Easy $80 if you have not installed Capital One shopping, only requires installing extension for 90 days.

Easy if you have not done it yet!

If you haven't signed up for Uber, it's an easy one!

Passive cash back on purchases you're making anyway. If you have an Amex card, you can opt to receive your earnings as Membership Rewards points instead of cash — at a 1:1 rate, which is a solid conversion for points you're getting on top of your card rewards. One of my top recommendations — I use it myself.