The Third Class (aka Steerage) was the working class, made up mostly of immigrants on their way to a new life in America. Single men were berthed in the bow and single women and families in the stern. Steerage berths were located on E, F, and G Deck.
There was a Promenade for use on B Deck in the bow and stern. A General Room and Smoke Room were available for use on C Deck in the stern and an open space for single men in the bow where they could drink and play cards. Scotland Road on E Deck was the main point of access from the stern to the bow and vice versa. When the ship hit the iceberg on Monday April 15th, 1912; the forward steerage cabins on G Deck began to flood almost immediately.
The upcoming video game Titanic: Honor and Glory will feature steerage like never before. No other PC game did that.