Studying computer science ?

I started studying cs at uni of afghanistan but the professors and mentors here are not good enough so students have to study mostly by using internet and youtube courses we are currently studying signals and i dont have any clue about them which branch of cs do they belong to? Should i study them in depth as a cs student?where should i begin any books recommendation? And is there any course or mentor that can help me complete my educations in cs ? 

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