Daily versus lifetime budget
Daily is the beginner default because it is easier to understand and adjust.
Type a daily figure and Meta averages it: the demo shows 350 rupees average, up to 600 on a good day, and never more than seven times the daily budget in a week. Lifetime lets Meta pace spend toward high-opportunity days but needs an end date - suited to a fixed promotion or event. Advantage+ campaign budget (CBO) instead sets one campaign budget that Meta moves between ad sets in real time; the trainer's advice is individual ad-set budgets first so you see where money goes, then graduate to CBO with several ad sets.
Budget type controls how fast and how evenly your money leaves.