Trouble navigating through Rocket.Chat app

I am a new Rocket. Chat application user and am facing issues navigating through the app. Anyone can update me on a site map or notify me where I can find it? Urgent responses needed.

do you mean the basic website web-app?

it should be pretty self-explanatory. Your open chats and rooms are on the left.
The chat is on the right.

You can read more in the documentation.

Thanks. Will go through.