Denoising and sharpening in GIMP Vs DT Vs RT

[Zbyma72age]

For many years, there are no guides for G`mic, everything should be approached through your own attempts and experience, in many cases the initial settings give satisfactory results.

Documentation for G'MIC filters (not G'MIC itself) ?

I’ve seen technical documentation for using / programming G’MIC itself but not for the filters. Obviously some of them are self explanatory, but equally obviously (to me at least!) many sliders / parameters are not clear… at least not to us who haven’t studied the underlying topic. In particular at the moment I’m interested in the usage of denoising and sharpening filters. Have I overlooked it? Thanks.

https://rawpedia.rawtherapee.com/Local_Adjustments