Breakdown of Da commercialista, lui sa quale priorità scegliere per la sua azienda.
lui
he
suo
his/her/Your
per
for / in order to / because of
sapere
to know
Questions & Answers about Da commercialista, lui sa quale priorità scegliere per la sua azienda.
Why is da commercialista used here to mean "as an accountant"?
In Italian, the preposition da (without an article) is frequently used to mean "acting in the capacity of" or "in the role of" a profession. While you could also say come commercialista, using da is very natural here. Be careful not to add an article: da un commercialista would completely change the meaning to "at an accountant's office".
Could we say che priorità scegliere instead of quale priorità?
Why is the infinitive scegliere (to choose) used instead of a conjugated verb?
This is an implicit indirect question. Because the person doing the knowing (he) is the same as the person doing the choosing, you can simply use an interrogative word (quale) + noun + infinitive (scegliere). It is a much more concise way of saying quale priorità deve scegliere (which priority he must choose), similar to how implicit alternative clauses work.
As a quick refresher, why do we need the article la in la sua azienda?