LawnMasterTE1016M Electric Tiller 10-Amp, 16-Inch,Green

What are 3 adjustable tiller heights? Where is the info how to adjust the height? I did not find it in the user manual

Will it cut through established yard?

Do you need to plug this in when in use, or do you plug it in to "charge?" I'm worried I wouldn't be able to reach an outlet to plug in and my garden

Will this work on a slope, not up and down, but left-right side slope?