Know your rights.

Look at the 10th Amendment...
https://tenthamendmentcenter.com/nullification-overview/

The Tenth Amendment makes explicit two fundamental constitutional principles that are implicit in the document itself.

1)The federal government is only authorized to exercise those powers delegated to it.

2) The people of the several states retain the authority to exercise any power that is not delegated to the federal government as long as the Constitution doesn’t expressly prohibit it.

In a nutshell, the federal government has a very limited number of things it is authorized to do. These powers are listed throughout the Constitution.