His warnings are apropos. Be subtle...subtext. Let your players absorb it from the environment. etc. Don't be a foolish n00b and blab it all out up front or broadcast it with a megaphone. Let it unfold naturally and be discovered by active exploration.It is the background information on the characters and setting explained at the beginning of the story. The EXPOSITION will often have information about events that happened before the story began. The EXPOSITION is often the very first part of the PLOT.