If someone is savvier, they are more knowledgeable or experienced about something.
Being savvier is usually a good thing. It means you know more and can make better choices.
Examples:
She is savvier about computers than I am.
He became savvier about the city after living there for a year.
The older kids are savvier about games than the younger ones.
The cat is savvier about catching mice than the dog is.
She is the savviest person I know when it comes to fixing things.
He got savvier about cooking after watching a lot of cooking shows.