Thanks for your suggestion, but to be honest I don't think there is really a need for a guide here. You can get explanations by shift-clicking tags and while this feature could be more discoverable and wording is often awkward, overall it kind of works. Cheers!
EDIT: there was a problem with my browser settings! Now the feature works, so pls do not consider anymore this post, sorry and thanks!
That would be fine, the real point is that shift+click (as suggested within the parameter window) doesn't work and I am not able to see any explanation. I use a Chrome browser with win10 (correctly updated). Pls let me know, thanks again