Engine 511 was dispatched to a reported outside fire, caller stated dumpster was on fire. Upon arrival, a fire was found in a residential dumpster at an apartment complex at which time the crew deployed a hose line and quickly extinguished the fire before it spread to the wood fence and the vehicles next to it. Once the fire was extinguished, the crew used this as a training opportunity to the new recruits on proper hose line management and how to hook up to a hydrant for a water supply.