As an abbreviation for "professional":
* "She's a pro at playing the guitar, she's been doing it for years."
* "The pro basketball players were impressive, their skills were amazing."
As an adjective meaning "expert" or "skilled":
* "He's a pro photographer, his work is stunning."
* "She's a pro baker, her pastries are delicious."
As a noun meaning "professional" or "expert":
* "The pros were playing a friendly game of golf against the amateurs."
* "He's a pro in the tech industry, he's worked there for over a decade."
In a phrase like "go pro":
* "He decided to go pro and play baseball after college."
* "They went pro on their YouTube channel and started making money from it."
The context will determine the exact meaning of "pro" in each sentence.