If you mean, being able to read, well, it is very hard to function in modern society if you can't read fluently. As almost all information is in written form. More specifically, well developed reading skills mean you have control over the type of information you take in. You can pick out key ideas etc. Children usually need to be taught reading skills like different ways of reading (eg fiction and non-fiction employ different skills), distinguishing fact from opinion and so on.
Advantage of reading skill
Identifying and evaluate some positive aspects of reading skills
Your mind can learn and process words and better understand them as well as learning facts
We can read more than normal.
It help the reader to make good abstraction I reading