What is your favorite life hack that has saved you money, time, or made your day-to-day activities easier?

These might be kind of lame or obvious

• Looking for open source software. I'd rather use Antenna Pod instead of Spotify for podcasts instead of paying for an app or subscription that may not be reliable.

• Drinking water when tired. It kept my hands busy and helped me cut back on smoking.

• Learning to solder helped me buy less replacement electronics.

Working for myself. I work a couple hours a day, make enough money to do whatever I want, and I never have to pretend anyone else is "above" me because of a plastic badge they earned by trading their life away for a fixed income.