The best advice I can give is having a problem chart pritty close to you and daily check up on leafs, leafs stems and the stem in general.....
If you look carefully the plant will tell you what she would like next it took me 13months and now I can grow nice beautiful budds, and I still cock up lol
This is the site
http://www.royalqueenseeds.com/blog-cannabis-nutrient-and-deficiency-table-n88
I use for starters to see what's the problem or what I think it is
Then move to( grow weed easy) sorry I don't have that link but easily found on Google and type read up they have a bigger list on what's causing the issue more easy to narrow down the issue and where you are going wrong.
Hope it helps, good luck and welcome buddy