DEFI Earn How does it work?How do some offer outrageous interest rates?

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New to crypto/defi. How exactly do the liquidity pools work? Why are some able to offer 100% or more APR? What makes one safer than another? I want to jump in but not headfirst in the hundreds of scams, schemes and con men out there. Thank you in advance.

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Mining:
Bitcoin, Cryptotab browser - Pi Network cloud PHONE MINING
Fone, cloud PHONE MINING cod. dhvd1dkx - Mintme, PC PHONE MINING

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Exchanges:
Coinbase.com - Stex.com - Probit.com

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Donations:
Done crypto