You should google them first to gain a basic understanding of your questions . .
for instance if you google. ..
"AM halftone screening" the top return is:
Halftone - Wikipedia, the free encyclopedia
an fairly comprehensive article on conventional halftone screening, its history and uses
"FM halftone screening" the top return is:
Stochastic screening - Wikipedia, the free encyclopedia
CFT is Computer To Film and CTP is Computer to Plate
etc. etc. etc. . . . not to be difficult but you need to do some research with your available resources and when you discover that there are questions that google or wiki can't help you with then come here and ask specific questions about specific issues not questions that someone could write many books about and still not address all of the permutations of your questions . . .