The best place to start will be on coinmarketcap, check the top DeFi projects listed there but be very careful chasing DeFi hypes for your investment. Rather invest in ETH and bitcoin and wait for your gains. The more you put in the more you gain (long term).
DeFi projects are now in the hype mode.
So be careful in jumping the bandwagon as it may not last long when investors realized that this is just another hype in the making.
If you want to invest, invest in the established ones like maybe Chainlink.
But it is up to you how you will invest on DeFi projects bu at least give a lil bit of research before sending your money to either one of them.