How do I calculate yield?

Hello, I'm curious about calculating yield in the world of cryptocurrency and finance. Can you please explain the process to me in a simple, step-by-step manner? I'm especially interested in understanding how yield is calculated for various investment products like staking, lending, and yield farming. Also, what are some of the factors that can impact the yield I earn? And how do I ensure that I'm making informed decisions when investing for yield? Thank you for your help!