Server-side development neighborhoods

brother before contact with the server -side development , most recently with a spring mvc wrote a small project , basically that is receiving data , processing data , check the database this process did not involve complicated issues , always feel lack of experience, knowledge systems are too weak. Would like to ask you, general server development in addition to basic logic processing in addition what needs attention , such as security ? Or performance ? Algorithm ? I should also add learn what does ? God please enlighten ! ! ~ ~
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own school , then focus on theoretical basis like,
server this regard,
Security: Cryptography , interaction protocol design
concurrency : distributed , high availability , load balancing

learn the theory, exposure to the real production environment after a quick glance understand
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learning language learning frameworks , it is estimated wants to engage in the database side of things , the next may be distributed computing what the contact , and then again I do not know . . .
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before contact with the case, the first use of skilled framework
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behind you will slowly come into contact with a variety of interfaces , networking, multi-threading and the like
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brother said well you all do not understand esoteric ~ ~ ~ ~
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Really ? Then I wanted to learn hibernate ~ ~
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brother said well you all do not understand esoteric ~ ~ ~ ~  

every noun can google a lot of things to learn , hibernate not associated with the server , mostly used in enterprise development . Server and generally are less than enterprise -class development , mostly in the Internet industry and the gaming industry will be more