Metagaming is one issue we encounter in tabletop RPGs. Players have their characters act on player knowledge that their character does not possess. A DM's defense against this is to gently remind the player to act within the confines of character knowledge. This can lead to an overcorrection where every time a single PC finds out information, the other players ask "do you tell us that?" Any time a strange routine like this becomes habitual, we should streamline the process.
While exploration is one of the Three Pillars of Adventure in 5th Edition Dungeons & Dragons, the rules provided in the core rulebooks are more abstract than mechanical. Those rules are now on the horizon. Here's news, analysis, and development of 5th Edition Travel rules.