It means that coco needs to be kept moist: due to it’s airy nature, oxygen can easily get to the roots. Watering/feeding daily keeps the root mass wet without drowning it.
Coco/perlite is the most common though vermiculite is used to provide additional magnesium (IIRC) which coco tends to hold on to (sequester). Cal mag is necessary for this reason.
I also second the use of Jack’s as the most cost-effective, easiest nutrient line in use right now.
I strongly recommend the use of fabric pots as this pairs well with coco (see the reason above).
General advice: buy the best lights you can afford. The lights generally sold on Amazon (with a couple of exceptions) are nowhere near the best lights going. Unfortunately lights are expensive. Get good meters: a digital PH and TDS meter are the two most used tools in the growers’ toolkit.
Ask questions: there are not stupid ones and we do not tolerate abusive posts (like some other sites do).
I’m using coco and the superb soil that comes in the pot for pot kit for my month old girl in a 2 gallon felt pot. The Seedling is coco with perlite, worm castings, and blood meal with a root booster 5 gallon felt pot.