How to choose curtains for your apartment?
 

It may sound silly but yes I have no clue for now as to what kind or with what kind of designing I should choose curtains for my apartment? I mean should it be like ''yeh wala acha lagrha hai'' or ''this looks nice'' and then I purchase it accordingly? Or should it be there some taste before buying those curtains.

Btw its for the bedrooms and the drawing room. anybody can give some ideas?

Thank you in advance to the lovely users :)