Joining Salah rules

• Joined before Ruku of 2nd raka, Catch up one raka
• Joined after 2 raka, Catch up 2 raka
• Joined after 3rd rakah, pray 2 more rakahs
• Joined if 4th, make up 3
• If you Join the Imaam during Surah Fatiha?

  You Can still join
• If you join in ruku of 1st rakah?

  You can still join
• If he says Sami Allahu liman hamidah in the first rakah?

  Do one more rakah