Answer:
1) first a bill goes to the house and is voted on, if passed then it moves onto senate
2) in senate it is again voted on if passed it goes to the president, if not passed then goes back to the house where changes are made to the bill
3)the president can sign the bill into law or veto the bill. If vetoed it goes back to the senate and changes are made (only 10 vetoed bills became laws, very rare to have a law)
4) hope this helps!