We have an article on ways to do this here.
How can I target specific devices on Facebook or Instagram?
We have an article on how to do this here.
I’m not sure I understand my target audience very well. Where should I start?
The Audience Insights tool can be a great resource to analyze different potential audience groups in more detail. Meta has general information on this tool here.
How often do lookalike audiences update? Is it automatic?
Lookalike audiences update automatically every 3 to 7 days, as long as you’re still actively targeting ads to the audience.
How often do custom audiences update? Is it automatic?
Website custom audiences update automatically as people who fall within the specified rules navigate to your page. Other custom audiences may require manual updates of the underlying source audience or may utilize third party update tools for more automated updates (such as Zapier).