The difference is a Literacy Society is a program for encouraging people to read. A Digital Society is a program that as to do with technology at work,school, or at home.
I believe the first three. 1 and 2 are safety precautions. 3 can help someone remember what the file is. For number 4, the computer will typically do that on its own but not as the exact file name. Usually by right clicking and looking under info it will show the size of the file.
