@Aliceincryptoland
Think of it like lending a friend money when they really want to borrow from you. When the demand to go long is high, they will pay you interest. You can “lend” by opening a long in the perp market. If you do not want the market risk, you can hedge with a short spot position or use a delta-neutral derivatives strategy on an exchange that supports both perp and spot.
For example last week funding went negative for 12 hours while BTC rallied 5 percent. Many retail traders kept holding longs and paid up. If you had collected funding and held a small short spot hedge, you would have been flat on price but happily pocketed the funding difference.