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darks, flats, raws even are not actually essential to get an image you can process with jpegs if you want. So use what you're comfortable with in darks and flats and you can often reuse those with different nights lights not ultra important to do every single session. But if you do you can get a better end result as your processing becomes more advanced. Starting out, focus on getting a bunch of lights stacked to get "a result". using raws, darks, flats, bias frames all just add improvements in different ways that you might not immediately notice but when you start to push your knowledge limits and the software limits and try catching ultra feint or small targets it becomes more essential to not cut corners in any part of your processing workflow and the less you use "throw all the files in and hit a button" options. I sometimes only grab a dozen or so darks but usually around 50 (i'm grabbing around 500 lights) and i'm still learning and tweaking how i process and preprocess. So dont put too much stock in numbers people give you. Make note of what you do so you have a repeatable process to capture and process subs to get a "final image". get that going first then start to break down the steps to more detailed and precise methods to improve things in the end. Its always fluid. As long as you're enjoying it andlike what you're catching. Youve got good detail there in that shot and you've now learnt dslr gives a green cast so you can now learn how to remove that, some software has a specific tool just for that.
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