The Halo series is a multi-faceted one. It's known for its multiplayer, both competitive and otherwise, but across the course of multiple games it's also rich with lore and set in a broad, well-developed universe.
Today, The Junglist takes an in-depth look into what's going on in the Halo universe in the lead up to Halo 5: Guardians.
Pretty useful. Particularly if you're jumping straight into Halo 5: Guardians and are in the process of wondering what the hell is going on.