Conventional and unconventional squares for PIECES

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pdve

What are some conventional squares and unconventional squares for pieces. For example,

Knights:Conventional:f3,c3,e5,d5,f7,c7,h2,a2,g4,g5,b4,b5 etc..

Unconvential:b2,g2,h8,a8

Also, which is the piece that is the most difficult to use optimally?

What are some unconventional positions?

Are unbalanced games more exciting that balanced and symmetrical games?

Would you rather have initiative or a good pawn structure?

When is a sacrifice justified?