How to read without forgetting key concepts

What is not to like about reading? What other media can engulf you in the wilderness of Alaska or the mind of a world leader at a critical moment of history, all from any place you would find fit for it. However, at a time when it's never been easier to have access to written content, it's also particularly difficult to commit to long-form reading due to distractions and the lack of habits. The Internet has predisposed to fast-food reading, making long-form more difficult to digest or even ingest.