See! That is why I pointed you to “source separation” as it deals more with separating sources rather than “denoising” or (as you say/mentioned “denoising techniques”). Removing noises using “denoising” kind of does work however (because it’s a quick fix) you lose a lot of details and the sources start to sound thin (and unnatural), which is why I dont “denoise” nor recommend “denoising” (that is if you’re serious about quality of course).
So again, if you really want a deeper dive into this stuff, I would highly recommend you learn “source separation”, however you might need to learn “dsp” first (otherwise you want understand the basics of signal flow and how signal works).
Let’s say I (or someone else) were to do an in-depth tutorial, what is it exactly you want to learn and what exactly would you want to learn how to do?