@Shweta Ramdas Welcome to Confluence! This is a life changing moment for you. Take a deep breath and survey your surroundings - you'll want to remember this in the years to come!
Atlassian University has some great free (and paid) resources. I highly recommend you take the Confluence Fundamentals course, which is free, recently revamped, and an excellent primer for how to use Confluence.
I also recommend you create a personal Space in your Confluence instance and just start playing there with creating, editing, formatting and using macros for pages and content - hands on experience is the best experience to learn from!
A few more resources:
How to Create a Culture of Knowledge Sharing
And of course, keep coming back here with questions and we'll be here to support you on your journey!
For public documentation we (docs.easyapps.app) use the Scroll Viewport app @K15t GmbH which I highly recommend. Confluence without such an app isn't great for public users, but great internally.