It is impossible to overwater in coco as long as you remove runoff from your drip trays.
ya this is not true at all
Coco can be over watered, its def harder than soil to overwater, but it happens.
Never let coco dry out completely
Use wet/dry cycles along with lift a pot method while they are small and roots are exploring
Always water coco with nutes, coco is inert, it will not hold nutrients like other mediums. You dont feed it, it will start feeding itself
Currently my girls are 24 days from seed, they are in 2g fabric pots and are being watered to runoff every 2 days( takes them this long to start feeling light again), within the next 2 weeks i expect they will begin consuming water/food atleast once a day, maybe twice, by mid to late flower they could be drinking 3-4 times a day depending on strain.
Go check out the hydroponics section, drain to waste...Tons of good info in that section about coco.