What he said ^^^.

Seriously, asking questions implying there there is only one right way to grow weed is the classic noob mistake, which you seem to be guilty of. And so many of the factors are interrelated, which is why you seem to be getting so many "depends" answers. How much should you water your plants? Depends what your temperature is and how much soil your plants have. How much soil should your plants have? Depends on your room temperatures and ventilation. How much should you ventilate? Depends on room temperatures and light power.

Really, it amounts to figuring out which things are hardest to change, and which are easiest to change, then adjusting the easy things to compensate for the harder ones. For instance, if your grow room is hot, that is hard to control if you have nowhere else to grow. So you can compensate for that by watering more, giving your plants more soil, increasing ventilation, and using a more heat-resistant strain. If your plants don't like it, you'll be able to tell.