rookie

A rookie is someone who's new at a particular activity or job.

You might hear this word used when talking about sports. A team owner signs a young player to join their team and they become a rookie, learning the ropes of professional football or basketball. They're not expected to know everything right away, but rather to learn and grow with experience. But the term 'rookie' isn't exclusive to sports – it's also used in other areas like business, where someone might be hired as a new employee and called a rookie on their first day of work. The idea is that this person is still learning the ins and outs of the job or industry.