DEFI protocols is safe or not?

Hi lovely community,

I am still new to the developer space.

My question is regarding the different DeFi protocols.

How to check if the protocols are safe to use or not.

How to prove that it is trustless.

Their are so many different kinds of like pancakeswap and farms.

Especially the protocols like belt.fi or acryptos.com.

Thank you guys in advance.