We're just over a month away from Metro: Last Light releasing on the PC, Xbox 360, and PlayStation 3. As we get closer to release, the Metro YouTube channel will be releasing a series of survival guides explaining what players can expect.
The first chapter here details how players will underground, and how to deal with the various factions controlling the different parts of the metro.
via destructoid http://www.destructoid.com/how-to-survive-in-the-world-of-metro-last-light-251190.phtml