I follow this guy on facebook. He offers a lot of online courses/info, and I signed up for the basic course just to check it out. I got a "special deal" for $9 so I figured what did I have to lose??? The basic course does a great job explaining all the basic operations, F Stop, Shutter Speed, ISO, Focus, etc.... There is also a lot of free content which can be very helpful.
Expert Photography » Tips For Photographers
One great thing regarding digital photography is it costs nothing to experiment. Shoot the same picture at different settings, F Stops, Shutter Speeds, etc just to see what happens. I use manual modes with my Canon 80D 99% of the time.