Medium

You can use any Soil that is not pre enriched with slow release nutrients like miracle grow. Peoples are happy with FoxFarm soils but many brand are good depending on your budget and needs , you can with coco medium but it’s not the same to manage. The nutrients must be depending on you as you can use organic or mineral nutrients like BioBizz or GHE flora series. There is a good article about organic soils in the journal section on the left menu

Fabric grow bags and biobizz soil have done me very proud From my little experience, the fabric grow pots wipe the floor with plastic pots, air circulation through the soil is 👌 The biobizz all mix soil means I can go sometimes 4-6 weeks into veg before even having to start to feed nutes I think the biobizz would work great with autoflowers which don't need nearly as much nutes as a photo period plant Goodluck growmie