The cropping and resizing tutorials are on YouTube and accessible from the links below. Each is about six minutes long. These are not professional quality just homemade. They do communicate what you need to know to be able to get the results you want using any of these three tools. If you do not have Lightroom or Photoshop I encourage you to view the tutorial on Nomacs, download the free program and use it. It is by far the best free tool for cropping and resizing. It gives much more control and is far less confusing. The blue mountain smoke image is by Anita Fanic, JCC Member.
The tutorial on PS is different from what I have done, but I really like that I can easily go back to the original. Very helpful.