Help diagnosing leaf problem. noob.

Hi all

This is my first grow, and atm im just letting it all kinda go its own way, but i returned home after a weekend to find some leaves had withered and died. Yellow spots have started appearing on other newer leaves also? i have tried to diagnose myself, but after returning a few different leads, i cant cant decide due to my laack of past experience, any light you guys could shed would be awesome!

I've tried to take a few pictures on my phone, but the quality is poor. Sorry guys
 

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