I have long been using rawtherapee but I am curious about darktable. But I stumble right when I try to process my first image: I cannot figure out how to move the plugin sliders except by dragging the mouse. I am very bad with the mouse; it is almost impossible for me to get to precisely the right value by dragging. In rawtherapee I can give the input focus to the numerical field next to the slider and then either use the cursor keys to go up/down with the value or simply type in the value that I think will work, but this doesn’t seem to work in darktable, and nothing else does, either, at least nothing that’s obvious to me. Please help, so I can satisfy my curiosity 
Do one of the following:
- hover your mouse cursor over the slider and use the scroll wheel
- right click the slider and move your mouse left or right
- right click and use your keyboard to enter a numeric value
I would add that the mouse wheel accept modifiers so you can make bigger and smaller adjustments
- right click the slider and use the < > (arrow keys)
That is my preferred way when on a notebook.
Hold CTRL when you scroll for smaller adjustments SHIFT for larger adjustments.
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On Windows at least
hover mouse cursor over the slider and use the < > keys
On Windows < > keys do not work after right clicking as mentioned @st.raw above