There are numerous Internet resources with regard to the federal wage and hour statutes. Be very cautious; I have found that much of the available material is not entirely accurate, current, or understandable. The most reliable source is the DOL Wage and Hour Division. Some of the employment law websites often provide more detailed and user-friendly information. It is essential to ensure that you understand how to apply the results of your research to your specific set of circumstances.
"The Payroll Process" (2022 edition) is an excellent and valuable guide as an accounting textbook and for reference by employers, CPAs, and payroll accountants. Extensive explanations and examples of various real-world FLSA quandaries and their resolution are included. https://www.amazon.com/Payroll-Process-2022-Procedures-Requirements/dp/0991423186is an Amazon link to this book. Quantity discounts are available from the publisher; send an inquiry to me via the Contact page, and I will provide an email address in this regard.