The main purpose of this legislation is to set specific limits on discretionary spending for the federal budget from 2026 to 2029. Discretionary spending refers to the portion of the budget that is decided by Congress through the annual appropriations process, covering areas such as education, defense, and transportation. By establishing these limits, the law aims to promote fiscal responsibility and control government spending. The key provisions of this legislation include the establishment of clear spending caps for each fiscal year from 2026 to 2029.