In addtion to letting us know a bit about where you are on the spectrum between beginner and expert, it might be easier if you pose a question on a specific topic on communications that you would like to know more about. Since you sound as though you are starting out with only a very basic familiarity with the terms.
Maybe you could begin by asking for more detail about some basic terms you that you already know a little about.
thanks for reply
i want to know what is the basics of communication like fourier series,,,,,
and what is mean by signals and how information converted to electromagntic wave .................