Every photographer has their own style of editing. Some don't even believe in editing and try to get their photos perfect as possible in camera (that's the dream!) and I don't think there is necessarily a right or wrong way to edit. But here are a few before and afters of mine.

The before shots are straight out of the camera and shot in RAW.
The after images were edited in Lightroom and Photoshop. 

A few notes on how I shoot images:
​I tend to shoot in Aperture Priority Mode, usually with a wide aperture, letting the camera set the shutter speed itself. This usually lets me shoot pretty fast. But sometimes requires more editing. Some of my photos are so dark to begin with, and would not have been if I had shot in Manual mode. Though I do prefer a photo being underexposed rather than overexposed as it is usually easier to bring back details in blacks more so than whites.

The above two photos were sort of combined together and then edited to create this photo: 

Happy editing!