Begin Step-by-Step Research -- Research Tips
See the section "Understand the Legislative Process" for links to resources describing the process. Don't try to locate the detailed documentation of the stages of a bill becoming a law until you clearly understand what those stages are.
At various points in your research, you'll almost certainly need the Public Law (P.L.) number and the Congressional bill number (e.g., S. 134 or H.R. 3370), so keep them handy. Record all the numbers, dates and citations you view, even if you're not sure what each citation means at first; e.g.
79 P.L. 396; 79 Cong. Ch. 281; 60 Stat. 230, H.R. 3370, PUBLIC LAW, NATIONAL SCHOOL LUNCH ACT,
JUNE 4, 1946, UNITED STATES STATUTES AT LARGE 79TH CONGRESS - 2ND SESSION
refers to Public Law 79-396, also identified as Chapter 281 of the laws from the 79th Congress, published in volume 60 of the Statutes at Large on page 230. The legislation originated in the House of Representatives as House bill number 3370 and became a law on June 4, 1946.
Read and follow the steps carefully. There are at least a thousand pages of documentation to wade through for most major laws, and some laws have tens of thousands of pages. These steps are designed to help the researcher locate clues about which documentation might be most helpful, thereby allowing the researcher to focus where time is spent. Some steps can be skipped because they only apply to laws passed during a specific time period (e.g., steps 5 through 7 only apply to laws passed prior to 1969), but otherwise it is best to work through each step in order.