maybe spend some time with the explanation by the creator of the,filmic rgb module: https://youtu.be/zbPj_TqTF88?si=XYCAopLQvZ82PH17
also a good starting point: a faq written by the developer of filmic: darktable's filmic FAQ
and a whole bunch of information: Let's learn Filmic RGB! Your one stop shop to understanding filmic-based approach to edits!
And a more practice oriented video: https://youtu.be/9B2WErOZY4M