Kindly refer to the following link(s):
Joining the imam after two rakats | Assim Al Hakeem
Missing a rakah during jummah | Assim Al Hakeem
Joining the Imam after missing one of more rakahs in congregation
Can I join congregation when imam is in the last tashahhud & gave salam to the right
Joined congregation when imam was in tashahhud or last rakat, what to do?
How many Takbeer to make while you join imam when he is not standing
When to raise hands for Raful yadain if you join imam in the second rakat?
Joined congregation when imam was in tashahhud, what to do?
How to pray when we join the imam in tashahhud (will end up making 3 or 4 tashahhuds)