What are the prerequisites for studying modern algebraic geometry? I have studied differential geometry , thought of starting to study algebraic geometry , but it seems completely different from differential geometry . It uses lots of abstract algebraic tools . I wonder how much abstract algebra do I need to learn in order to learn algebraic geometry . Possibly , some reference of algebraic  geometry books will much helpful .  Another thing I see a lot in lecture notes on introductory algebraic geometry is the usage of angle brackets , i suppose they something completely different . What do they mean , anyway ?
Prerequisites for Algebraic Geometry Is it possible to get into algebraic geometry by just knowing calculus and linear algebra or is this too far of a stretch?  If not could anyone give me a list of book/lecture notes recommendations in chronological order to dive into algebraic geometry with my state of knowledge?  Thanks
What is the difference between a telephoto lens and a zoom lens? Looking at the , I notice a distinction between telephoto lens and zoom lens.  What is the difference between the two?  Why would I want one over the other?  I  but remain confused about this distinction.  Please talk to me like I'm stupid. :) I am hoping for a completely lay explanation.  In particular, I'd like to understand in what situations I'd use a telephoto lens, and in what (other) situations I'd use a zoom lens.