Most federal statutes relating to education are in 20 U.S.C. Federal regulations relating to education promulgated by the U.S. Department of Education are in 34 C.F.R.
The United States Government Manual is updated annually and is the official handbook of the government. It provides a good overview of government agencies and how they work. For more detailed federal agency information, see the latest edition of the Federal Regulatory Directory, REFERENCE KF5406.A15F4. You may also find the A-Z Index of U.S. government departments and agencies helpful when trying to make contact with someone from the Federal Government.
The Department of Education website: https://www.ed.gov/, links to the statutes, regulations, and guidance documents in the areas of Higher Education, Adult Programs, Birth to Grade 12 education, Teaching and administration, Grants and Programs, and Laws and Policies.
Both Westlaw and Lexis provide Education Law practice areas on their online platforms that include access to case law, statutes, regulations, and secondary sources.
Guidelines or guidance documents are internal agency documents that represent the federal Department of Education’s interpretation of the applicable statutory and regulatory requirements, frequently in the context of specific facts. They are sometimes very specific and detailed, providing formulas and illustrations to help school administrators, teachers, and parents understand legal requirements relating to education. They are not legally binding and do not impose any requirements beyond those given in the statutes and regulations. However, they do represent the agency’s current thinking on a particular topic and are a valuable secondary source. They are issued by the U.S. Department of Education and published in the Federal Register and may be included in some education law treatises. Generally, they are not published in the Code of Federal Regulations, but they are available from the Department of Education website under the "Office of the General Counsel"
Title 15 of the NH Revised Statutes Annotated (RSA) covers Education and can be accessed using the print RSA set or using an electronic version on Lexis, Westlaw, or Bloomberg. The State of New Hampshire provides compilations of NH Education Laws at the NH Department of Education's website. These electronic compilations date back to 2017. Prior to 2017, the publishers of the state statutes have offered selected education law annual statute volumes for convenience. These are an extraction of selected statutes from the full state statute publication. For example, New Hampshire has New Hampshire Education Laws Annotated (shelved at the end of the N.H. Revised Statutes Annotated), an annual publication providing a handy one-volume copy of state education laws.