Although I'm a NOOB here, I like Mogie have had many harvests. And while I agree about some of his points, I disagree very much with others!
1. Marijuana does very well with "wet feet". Many varieties can be very healthy and produce very well in wet conditions, provided the soil is light enough. In the wild, Marijuana grows near creeks and streams, in gullies, etc.
2. Marijuana can thrive, and even do better, when temperatures are between 85 and 100 degrees. This is absolutely true outdoors--just look at the wild hemp in the Midwest of the US, or ask your grandfather about good old Mexican pot like Acapulco Gold. The reason it sometimes doesn't do well in high temps indoors is because there can be excessive humidity, or lack of circulation, inadequate water, etc. When it's hot, pot needs a lot of water--containers dry out rapidly. The plant will transpire rapidly, and that water vapor must be moved away from the plant.
Personally, I like the buds in my flower room to be at 85 degrees. I like the canopy of my grow room to be at 90 degrees.
3. Burning the foliage. I like to burn a little foliage in the last four weeks of flower. That tells me the lights are a little too close--but an inch further away, they're perfect. Our lights fall off in intensity so rapidly, I don't like a little burn to scare me! For one thing, in order to get high yields, I am giving the plants as much food as they can handle. But because the leaves closest to the lights are transpiring the most, a few of them will get over fertilized, and thus burn, even when the lower parts of the plant are getting just the right amount.
Basically, Mogie's comments are right on, in that experience and skill are what leads to success and high yields. But I'd like to suggest that a good deal of the commonly accepted wisdom about what works growing MJ is subject to careful, skeptical re-examination. I know that I saved a substantial amount of time and work, and have done very well for myself, by tossing most of the "common knowledge" in the waste basket!