Recommended · for some experience
DIY Adjustable Constant Load (Current & Power)
Why people recommend it
Linked for GreatScott's DIY adjustable electronic load, built around a MOSFET and source resistor, with a section explaining the MOSFET driver from about 5:30.
Watch for: A written Instructables version also exists
In their words
His explanation in the video about the mosfet driver: youtu.be/VwCHtwskzLA?t=334
Jot on electronics.stackexchange.com, Jan 2019. CC BY-SA.