This article from the National PTA features ideas on how to help your school age child improve their reading skills and tips on how to develop pre-reading skills in younger children.
Summarizing teaches students how to identify the most important ideas in a text, how to ignore irrelevant information, and how to integrate the central ideas in a meaningful way. Teaching students to summarize improves their memory for what is read. Summarization strategies can be used in almost every content area.