Well....i can provide some.A problem I've consistently seen is defoliating far too early.
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1.) Too impatient/too much interaction during germination/seedlings. Wanting to see results Ive seen people uncover seeds in dirt to see if a tap root has at least developed yet.
2.)Ph levels and nutrient lock out. As a grower for fun I knew you could over feed, but I didnt know too much acidity prevents roots from being able to gather nutes
3.) Soil composition i.e. drainage and not being tightly packed in the pot you're growing in.
4.)Lighting. How much, what wavelengths. Its kinda more advanced, but with the amount of info given on gro lights now it can be confusing.
Also recommend the growers guide in ebook form so you can look up definitions of terms and sciency stuff you dont understand. And you can book mark as many pages as you want to reference in the future.
Hope it helps!