For my 2nd indoor grow: 3 greenhouse hybrids I'm going to add greenhousefeeding nutrients.
I want to achieve a top result.
Is supermarket soil + perlite enough?
Or what should I put in my flower pots to have the best soil?
Depends on how well you want them to grow. Soil is harder on plants, and roots can only do so much. Now if you do coco coir and perlite. If you properly maintain the coco the plants will get far bigger, more potent, and bigger yields. Or do a dwc.