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)
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.
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.