Eventually they are useful to students and creative professionals who have to deal with Photoshop as well.

A very common command in Photoshop is CTRL-Z for UNDO. A lesser known command is CTRL-- to FADE the previously done operation, which is eactly the same as UNDO just with a slider to set the exact amount of UNDO you want to apply.

One can actually do blending mode operations, but I recommend doing so only if you know exactly what you do, it also doesn´t work with all operations and the outcome can not be predicted.

This means, regardless if you´ve applied a filter, a brushstroke, a color correction or anything else, as long as it can be "undone" it can be "faded".

A common use in my daily routine is Edit->Auto-contrast and since the "Auto-contrast" is sometimes stronger or harder than I want it to be, the command: "Edit->fade" comes in handy here, because I can apply 10%, 50% or 70% of the previously taken action, which gives me a powerful control over my work at any given time.

An advanced option would be to assign this command to a button on your wacom tablet, depending on how much you use it. I did so and it saves a lot of time.