Just because peole use hydroponic equipment to grow ganja doesn't mean A. Cannabis ISN'T a vegetable, or B. That everything learned from growing weed isn't directly transferable to growing food crops.
I was growing hydroponically in high school- in a greenhouse. We ran tomatoes, pole beans, lettuce, spinach and much more, and sold what the private high school didn't use. We used sand beds for the leaf crops and top drop irrigation in containers for the tomatoes.
Come on, people! It's gardening, not rocket science!