CreativeLive has many excellent instructors for whom I have nothing but high praise, and some have classes or segments on blending modes, but Photoshop Week 2017 was the first time that I finally "got" blend modes.
Kudos to Jesus Ramirez for covering a lot of ground. In this class, Jesus explained the rationale behind how blend modes are grouped and how each group affects pixels. His methodology - applying each blend mode to the same photo, blended first with a luminance chart, and then with color wheels - was very effective at illustrating the impact of each blend mode - a visual representation of what each blend mode does accompanied by an introductory explanation of the algorthm. He also illustrated how he had used the effect in his own work, provided useful advice, and left room for our own creativity to take flight. This one-hour class has something for beginner to advanced Photoshop users alike. Well done!
I would recommend it for beginners but when it said "like a pro" I assumed it would be more advanced. It covered the groups with mainly one example from each group. What I was looking for was some knowledge of all the modes in a group and the relationships. I know that lighten lightens and so does screen but what is the difference and when to apply each. Same with color dodge and linear dodge, and all the various members of all the groups. Otherwise I am doomed to merely "scroll through and pick one I like".