"Qualifying something.... for a usage"

Bonjour Anne !

Thanks for getting in touch :)

Indeed, I apologise for the lack of clarity there. What I meant here is that "bon/meilleur" is used to qualify the "efficiency" of a thing, i.e. that it's good/better at what it does (hence the awkward "usage"). For example:

I've now updated the lesson, and I hope that's much clearer :)

Merci encore et bonne journée !