Which publications of NIST are considered mandatory?

"NIST is a US government entity that creates
mandatory standards that are followed by federal agencies and those doing business with them"

How do I go about compiling a list of mandatory practices or is there an easy source?

I understand general practices, but I havent gone through NIST very much except for glancing through 800-53

business cybersecurity doing easy federal federal agencies general government list nist practices publications standards understand