Here are some in-depth articles from Sound on Sound regarding the use of reverb. Since these are over 3 years old, perhaps someone has posted them before. But if you haven't read these, there are many excellent quotes from pro producers and informative insights to apply to your tracks. The author even earns bonus points for using Reaper to create the audio examples. Enjoy.
Use Reverb Like A Pro: 1
Use Reverb Like A Pro: Part 2