How to study chess openings?

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Avatar of brownhovlin

Hey guys, i have one question. How to study chess openings correctly? I have some basic knowledge in few openings, but i cant say i know 100% opening theory. 
How to study? I have idea to study one opening per month, focusing on one variation each day or something like that. Learn allmost everything in Spanish, Italian, Queens gambit, Kings indian, Sicilian and so on. It is even possible to memorize everything after finishing studying theory? 
And next question is, when looking at my games? What do you think? What is my biggest weaknesses and strenghts? 
Thank you for your answers. 

Avatar of khaleesi_13

Malá učebnice šachových zahájení Jerzy Konikowski Břetislav Modr