Hi @Gianni_Saccardo, thanks a lot for your (willingness to) help! The list by @paperdigits is not meant to be either complete or necessary, it is just showing some examples… so, no need to cover them all 
I’d add another one too: if you have a colour target, you can take a look at this:
https://discuss.pixls.us/t/last-call-for-color-target-shots-for-inclusion-in-rawtherapee-5/3080
P.S: yes, I’m Italian