Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Semi-final: (2 matches) The four provincial representatives make up the semi-final pairings. Two teams are eliminated at this stage while the two winning teams advance to the home final.
Home final: (1 match) The winners of the two semi-finals contest this game. One team is eliminated while the winning team advances to the final.
Final: (1 match) The winners of the home final and London, who receive a bye to this stage of the championship, contest this game. The winners are declared All-Ireland champions.