Hey! I'm doing my first as well. I've found that a lot of research is essential, and this is a great place to observe a wide variety of growing conditions and experiments.
I've found that in the first grow, you're more reacting to situations. Next time, I'll be more proactive and understand more about how all the nutrients work together, etc.
As far as reacting to situations goes, the following site helped me a lot. It lets you click on each of the most common deficiencies and gives a detailed explanation about that nutrient. What it does, why it's important, which nutrients it needs or which ones can cause lockout, etc. https://www.royalqueenseeds.com/blog-nitrogen-deficiency-in-cannabis-plants-n589
Good luck :)
like 1