Question about Autofarm

Hello guys, I've heard that there is something called autofarm and I've seen how it works. Usually you have 2 cows and just lay something on your main accounts mouse so it hits by itself. Though my question is, How do you experienced farmers autofarm? Can somebody explain this for me, would appreciate it a lot since I want to start to farm and I would like to learn the most efficient way to autofarm to waste the least time as possible. Thanks in Advance.

Actualy U Must To Have A MultiClient and and AFK-Bot and Open Cows and with your main Account and kill them so u will have high Exp and this is calling to farm And About Source I Donot Know From Where Actualy I Want Them Too..