Learn Croatian: Volonter daruje odjeću. - The volunteer donates clothes.

Verbs ending in -ovati have a special rule in the present tense. You drop the -ova- part and replace it with -uj- before adding the present tense endings. So the base becomes daruj-, and to say "he/she donates", you add the ending -e to make daruje.

Is odjeću plural or singular here? The English translation says "clothes".

In Croatian, the base word odjeća is a feminine singular collective noun, similar to the English word "clothing". Even though it translates to "clothes", it uses singular grammar rules. It changes to odjeću here because it is the direct object (accusative case) receiving the action.

Is daruje just another way of saying "gives"?

Not quite. The general verb for "to give" is davati, which becomes daje in the present tense. Darovati (daruje) specifically means to donate or to give as a gift. It is related to the noun dar, which means "gift".