All indications are you use either Photoshop or Lightroom. If you are editing one image at a time, they would both work, but I'll be you use Photoshop. But if being efficient is your goal, you will want to invest in Lightroom.
There are a few resources for you to learn how to use Lightroom to its fullest capacity:
Mastering Lightroom: The Library Module
This is an e-book by fine art photographer and author Andrew Gibson. You can buy Mastering Lightroom: The Library Module from Andrew's website, or here at PhotoDough.com for the next few days for $7. Andrew is well-known for his concise writing and clear teaching style. Learn more about Mastering Lightroom here.
Lightroom 5 Unmasked
Lightroom 5 Unmasked is an e-book by Piet Van den Eynde and distributed by Craft & Vision. It's 356 pages deep. If you are ready to go in for a deep dive, this might be the one you want to consider. If you are still using Lightroom 4, however, you may want to buy this e-book by Piet Van den Eynde instead. Also check out out other ebooks by Piet Van den Eynde here. Either version is $20 each. Both are well-researched, provide interesting case studies and are exquisitely designed with a wonderful array of visual examples.
Adobe Lightroom 5 The Missing FAQ
This tome by Victoria Bampton, an Adobe Community Professional & Certified Expert for Lightroom, is very well regarded in the industry because Victoria constantly finds ways to upgrade it and make it better as Adobe tinkers with the program. If you have a question about Lightroom, this is the go-to-guide for you. It's about $50 for both the e-book and paperback versions. I would get both if I were you. Also, get a flavor of her writing through this free Lightroom 5 Quick Start Guide.
There are obviously other fantastic resources available for learning Lightroom, but I wanted to get these three resources in front of you as they are likely to appeal to someone who wants to get their feet wet in Lightroom quickly.
If you are one of them and you buy any of these e-books, would you please come back here and tell me what you thought of them? Thank you!