The U.S. Equal Employment Opportunity Commission (EEOC) publishes on its website advice and information of interest to small businesses.
To learn about employment laws that the EEOC enforces, go to https://www.eeoc.gov, and under "Employers & EEOC" choose "Small Businesses," then "An Overview of EEOC and Small Businesses." What EEOC laws apply to small businesses?