If you’re looking for dead simple, look into supersoil.
No, you don’t have to mix your own. You can get a supersoil concentrate off amazon that you mix with good soil. I like the platinum growers mix from Coast of Maine, and Mother Earth had a nice soil as well.
Add 1.25lb of the concentrate to a 5gal pot, add regular soil until it’s 1/3 full. Mix really well (I also add a little bit of worm castings).
From there, top off the pot with regular soil. I also add worm castings and a couple minor nutes and mix into the top 2/3, and then add a dozen red wigglers.
Water only, no mixing or fussing or squat. (Disclosure: longer running flower times either need more supersoil in the bottom, or you may have to supplement with some nutes towards the end.)
Dead simple, and one hell of a time saver.