Non-PRO English to Indonesian Science Linguistics linguistics

would you please tell me about Jakobson's theory?
# why didn't he put arrows in his diagram to show the communication
process?
# how does exactly the chronology of the process of communication
according to his diagram?
# what is context? (in Jakobson's theory)
# to me, context and message sound overlap...
please explain to me what are they?

I'm a beginner in linguist, and I'm interest in communication
theory.
So, any kind of response of this message deserves my deep grateful. :))
Please apologize me for my terrible English thank you