Audio Systems: need to ask, sound reinforcement handbook, production engineer

Question
hello

because I m confuse , dispersed  in the roles of for the following positions :

what an Audio engineer does ?

Live Sound engineer does ?

Post Production engineer does ?

whats the mixing engineer does ?

can someone do the 4 roles ? if yes whats the name describe that position ?

whats of the above roles may done sounds design for movies & TV ?

wish to hear from you soon
thanks

Answer
Purple....it sounds like your looking for a basic education in audio. If I could answer the questions you ask in 10,000 words I would not even scratch the surface. I don't know where you live but there are many places that teach courses in audio. I occasionally teach only not on this website and when I do I am paid very well for the seminars. If you want the  questions answered above, there is a manual published by Yamaha called the Sound Reinforcement handbook. Novices, beginners, advanced students and practitioners alike considered it the bible of the audio business. You should invest $20 and buy one. It will answer all of your questions and many more that you may not be aware of. If you find it too arcane then you will definitely need a basic audio course.

FYI - most people start in this business by working for no pay for several months just to demonstrate their willingness to learn. That's what your up against.