How to build microservices for simple blog app?

Hello All,

I want to learn about microservices (NodeJS+Mongodb) and want to build a blog app with Docker. But I don't know how to start with that.

Requirements:

1- Any user can login and create blogs.

2.Login users can comment on blogs.

So I request you to please provide me little basic starting point for the same.

Huge thanks in advance.