so u want to make dynamic site ...
i have made some ...😅
the idea is
make main page where all users can see all your posts ..
and a sub page which will be password protected and only your client can open it with password ...
and in that page he can perform crud operations ...😇
But if you just want to make a blog, Google provides Blogger, where you can make a good blog site without knowing how to code a website.
Roshan Yes, if you have a server to run your web app, then you can make a chat box/messaging facility in your web application.
You could also request Google for a hangouts API, and integrate it in your website, although I haven't tried this one yet. (It might work, cause Google gives Maps API)
You can either learn to code build your own website, or otherwise there are platforms which help you to build a website without coding, although it won't be as flexible and attractive as the websites you build on your own. I will suggest some platforms for you though. In some time.