The Views module is probably the most important contrib module to learn in Drupal. However, Views is a Beast to learn. It has a gazillion of settings, twice as many use cases and can be kind of frightening to even look at.
This video series introduces Views in a pretty soft way, starting with the easy stuff to get going, and then builds the more complex stuff on top of that. There are 30 videos in total, so make sure you have a pot of tea before starting.