I started as a pure JPEG-photographer, but Darktable sparked my interest in RAW-photography. Darktable has its quirks, especially for a complete beginner, but its manual way of doing things forced me to learn some fundamentals, instead of just sliding some sliders to see if something sticks.
What is your workflow in Darktable? Which module is a game changer for you?
These are the steps I almost always take:
denoise (profiled): Match with the ISO of the photo, sometimes reduce 'preserve shadow'
Lens correction: correction method: Lensfun database. It finds my camera and lens and I like the correction most of the time.
exposure: turn up the exposure until my subject is well lit.
crop: to compensate my ability to hold the camera horizontal
color calibration: I often use the eye dropper on a neutral color, or on the whole picture. Then correct the hue and chroma a bit, until my picture is as balanced as possible.
diffuse or sharpen: Preset 'lens deblur: medium' to get it sharper
diffuse or sharpen (second instance): Preset 'local contrast'; I often turn up the iterations, I like it contrasty.
color calibration: Preset 'basic colorfulness: standard' to get the picture more colorful. I often add even more saturation. What are those chroma-sliders for?
filmic rgb: I use the eye droper for the white relative exposure. For the black relative exposure, I take a look at the darker parts and turn it down, until I can see enough details in the shadows.
I experimented a bit with the red/green/blue-channel in the color calibration module, according to Boris Hajdukovic. That was fun, but the modules 'color equalizer' and 'rgb primaries' are a bit easier to use to tweak the colors.
The 'tone equalizer' is also often used to brighten up the darker parts of my pictures.
Exposure I normally leave as is, preferring to use other modules to fix exposure issues. There are exceptions, but generally, I leave this module alone on its "scene referred" default
I apply haze removal, chromatic aberration, lens correction, denoise (profiled) and raw chromatic aberration without modification, though I will sometimes leave out haze removal if the image is high contrast straight out of the camera
Tone equalizer, I tend to set to "contrast tone curve: soft", but again, this one will get adjusted as needed.
Local contrast. I always use this, mostly on "clarity" , but I will use HDR tone mapping if it's a backlit subject or the like
Sharpen. I rarely use it, as most of my photos are done with pro glass these days, but if I've used a tele converter or the like, I'll sometimes use this modeule
Colour Balance RGB. This is where I do most of my work. Up until now, I've use presets, but here, I use either "standard" or "vivid" as my starting point, before tinkering. For all of my adjustments here, I use the "RGB parade" panel (rather than a histogram) to watch the exposure and colour balance. I typically start on the 4 way tab, and adjust "power" and "shadows lift". Then on the master tab, I'll adjust the perceptual brilliance grading. This is where I correct any remaining exposure issues, and to some extent, contrast issues. Then, I'll play with vibrance and contrast a little, just to tweak the final result.
If I am really struggling with a poorly lit subject, or a contrasty background with a non contrasty subject, I'll create a second (and sometimes even a third) Colour Balance RGB module, and use "drawn and parametric masks" to selectively adjust the areas I need. The killer secret to make this work is after you've selected your area, increase the feathering to smooth it out and blur it, and then increase the mask contrast, to make it respect borders. I find that tweaking these is best done with the mask preview turned off.
Finally, if I'm not happy with the temperature/colour cast, I'll use the "colour correction" module. This one is display referred rather than scene referred, so I always leave it until last. There are other options for adjusting this, but I find the ease of moving the offset point around the colour map too efficient to pass up. I can quickly move through a lot of options and find the value that looks best.
I think I'm the only darktable user to not use filmic rgb :)