Questions about prayer

Assalamu aleykum wa rahmetullahi wa barakatu, I'm learning how to pray and I have some questions...

1) I know that you shall not say "subhanaka" in the second rakat. But how about in the third and fourth rakat?

2) Do you say "at-tahiyatu" in both third and fourth rakat?


3) In which rakats do you say salatul Ibrahima?

May Allah, subhana wa ta'ala, reward those who answer, I seriously need it...