My plant is not doing well, why?

A question from a fellow grower:

My plant is not well and I don’t understand why…

If you do not know, or do not use something; Just say so = NA
Strain; Type, Bag seed, or NA

Soil in pots, Hydroponic, or Coco?

System type?

PH of runoff or solution in reservoir?

What is strength of nutrient mix? EC, or TDS

Indoor or Outdoor

Light system, size?
Temps; Day, Night

Humidity; Day, Night

Ventilation system; Yes, No, Size

AC, Humidifier, De-humidifier,

Co2; Yes, No

To much water is just a guess, I’m still learning.
Tom