Best medium

this question is to open ended. First descide if you want to grow in soil or soilless or hybrid of the two. Then decide from there the nutrients you will buy. Soil can use dry amendments and liquid fertz. not all fertz are created equal. If soilless you can also use dry amendments if its got a solid medium like coir ot peat as well as liquid fretz however if you doing soilless like DWC aka just water you need to use liquid. the amendments will clog everything up. Might be easy to go soilless with a peat/coir mix and perlite and then a basic and simple fert that's mix x amount n x water and pour. get runoff and dispose of it. Jacks is good, teraaquata is nice, fuck even miracle grow can work well if it has the micros. Maybe read some guides and get a better grasp on things, I have heard cocoforcannabis has nice ones that take out the fluff and BS of cannabis growing. Their is loads of bro/psudo science in this. So grain of salt and verfy your sources and realize most places are trying to sell you something or are just publishing shit for engagement like breeders house blogs. not all of them are worth your time.

Coco will give a good start for autos using the canna coco line is a good start, it depends what's good for you really but that way couldn't be easier it's 1 formula all the way threw so you learn the feed ratios quick and it lasts forever almost. 1mll to 2mll in most cases, add the pk 13/14 and calmag and your good to go..

for yor first i would say - soil ; something like Cana Professional Plus or Plagron Royalmix + a small bag startersoil