We’ll get into more specifics later (like Schoolhouse Rock), but here’s a quick overview of what the Constitution says about the law-making process.
After a bill passes the Senate and the House, it goes to the President. The President can sign it (make it a law) or veto it (not make it a law). If the President vetoes it, ⅔ of the House and the Senate can vote to override the veto, and it becomes a law. Or, if the President receives a bill and doesn’t sign/veto it within 10 days (not counting Sundays), it becomes a law. BUT if the President receives a bill and doesn’t sign/veto it within 10 days – but Congress isn’t in session after those 10 days – then it doesn’t become a law (this is called a “pocket veto”).