I’m a big fan of worm castings 
Each grower has their own conditions, some common but most unique to their area or more local to their particular situation.
Like, a lot of growers are using municipal tap water and need to let it sit for a period of time to let the chlorine dissipate out. In my case, I use well water and it is very acidic, comes out at under 5.0 pH, too low growing cannabis in soil.
And some growers use an inert medium and need to add the nutes. Or they’re using nute charged soil that becomes depleted mid grow. I am currently growing organic and started mixing my own soil, two parts of which are Fox Farms soil products. First time I did this was last grow - I’ve got some more cooking right now for the next. Last grow, I had two sisters of the same batch grow side by side, one I had to top dress (nutes) 3 times, the other none. She grew her whole life on what was available in the soil. Sounds like you were fortunate in this way. 
