PRESTAR is commonly only used to express three things:
(1) providing, supplying a service.
(2) expressing someone or something’s worthiness.
(3) expressing to pay attention.
| to to deliver, be worthy | prestar | ||
| I’m worthy | eu prest | o | |
| you/he/she is worthy | você/ele/ela prest | a |
providing a service: Quais serviços eles prestam? ➜ What services do they provide?
worthiness: Ele não presta. ➜ He's no good.
paying attention: Presta atenção! ➜ Pay attention!