have a handle on

The volume, an illustrated exploration of 64 museums whose names you are unlikely to know, draws on a decade of research and stands as a challenge to all Angelenos who think they have a handle on the local cultural landscape.

She says the industry still does not have a handle on the parasites and diseases "running rampant" through fish farms, which she believes are too densely stocked.

Does McVay have a handle on the new rules?

“It’s something we just don’t have a handle on yet.”

"Now that we have a handle on the core of the mechanism by which stress-induced fear happens and the circuitry that implements this fear, interventions can be targeted and specific," said Spitzer.