Layoff notice, what does the 60 days mean? after 4 years as an insurance claims processor

My employer announced that the site will close and gave us written notice. This is my first time dealing with any of this. They offered a retention bonus for people who stay. Has anyone been through this?

Start your search early. I wish I had begun the day of the notice.

Write down key dates and keep copies of the notice. Mine helped when a question came up later.