Assalamu'alaikum. Most of us might have known about the way to answer Adzhan but for those who have not, you may google it and I'd recommend SHAFIQALBU.
This is the hardest thing to practice despite being so simple and easy, to me at least. And this post I dedicate to the worst enemy I have had and would always have, i.e. My Own Good Self.
~ Nai at Tak Pe Je.