Yellow leaves for no reason

[cannafarmer420]

usually i'm not a fan of video either it take age to get the usefull infos you need, i much prefer writed articles but i know this guy is legit and has a nice compilation of recipes

https://www.google.com/search?q=homemade+fertilizer+recipe give some results also.

Always looking for resources to learn!
The "teaming with" series of books is great if you are looking for material