Learn Italian: Ognuno capisce il talento del partecipante. - Everyone understands the participant's talent.

Even though "everyone" refers to a group of people, the pronoun ognuno is grammatically singular in Italian (just like "everyone" or "everybody" in English). Therefore, it must always be paired with a third-person singular verb, like capisce.

Could I use ciascuno instead of ognuno in this sentence?

Yes! When used as pronouns meaning "everyone" or "each person", ognuno and ciascuno are basically interchangeable. Ciascuno places a slightly stronger emphasis on "each individual person," but the overall meaning of the sentence would remain the same.

Is there a plural form of ognuno, like "ognuni"?

No, ognuno only ever exists in the singular. If you want to use a plural structure to say "everyone understands," you would switch to the pronoun for "all" (tutti) and use a plural verb: tutti capiscono.

How do we know the gender of partecipante since it ends in -e?