My dad has grown on & off my whole life, I secretly paid attention.
I was part of a couple of different friends who also grew's "trim teams" where they'd talk shop while we trimmed for hours on end, whole weekends I've even taken a week off work to help trim & just SPONGED all that info.
I helped another buddy who grew, who was semi disabled, I'd help him clean and reset his recirculating tables & tons of fucking hydroton. I hated cleaning that shit, that alone i was like "I ain't doin DWC"
Did like a year of internet sleuthing before I presented a solid "business plan" to my wife during COVID, and off we went. So far, do good. A few hiccups and subpar harvested plants but nothing serious so far.