DWU2 wrote:
I like Victoria Brampton's book, cited above, but also recommend Lightroom CC Book for Digital Photographers by Scott Kelby.
I also find Scott Kelby's books to be helpful. He also has a book on PS, but spends way too much space on Adobe Camera Raw (ACR). LR and PS have a great interface, making them work very well together without ever going to ACR in PS!
Another good resource is CreativeLive. This is good for having someone show you what they are doing. Often better than reading in a book. They have free tutorials, find these on their website under "On Air" under which you will find listings of what is on air now, and what is upcoming. If you really like a tutorial (they may go through things too quickly for you), you can purchase access to it so you can use it any time. And videos can be paused or you can go back and repeat that last part. All levels of photography (as well as other subjects) are covered, and the instructors are excellent.
Scott Kelby also has a subscription website KelbyOne where you can choose from their wide selection of video tutorials and watch them in any order you like, at any time that is convenient for you.
Lots of professional photographers have their own websites, and many offer free tutorials and ebooks as well as ones you can purchase for your continuing use. I have learned who they are through both of the above websites, as well as by searching for websites of pro photographers whose work I admire. By looking at their sites, you will get to see more of their work, as well as discover whether they offer any learning materials.
By using different sources for learning LR and PS, you take advantage of multiple teaching styles, and also the different tips that one will present, while another gives you another!
I will also repeat what others have said: Tackle LR first. It is more intuitive, having a large percentage of adjustments made by moving sliders. The other tools are also easy enough to use - learn one at a time, and each subsequent one will be easier as you go along. Make virtual/proof copies to work on, so you do not work on your original. This allows you to make as many copies as you like, and try out different editing techniques. Experimentation is important to the learning process!