How to make website ?

Your knowledge is not going to help you create a website: you don't use either C or C++.
You need HTML / Javascript at the client side, and probably either VB / C# or PHP at the server side.

You can start creating a website with just client side code: W3Schools Online Web Tutorials[^] will get you started, but for more flexibility (and anything remotely resembling security) you will need server side code as well: ASP.NET Overview[^] is a place to start.

Or ... there are "website builders" available: w3schools tutorial - Google Search[^] but frankly, they don't produce anything you'd really want to use in the real world, beyond a basic site.

If your ultimate aim is to write a website then, as mentioned, you're going to have to learn html and css as a minimum. That will get you a static website, but if you need a site that is dynamic (ie it "does things") then you'll need a server-side language too to generate the dynamic html. Again if simply making a site is your aim then you're better learning a language that can be used with one of the off-the-shelf web building frameworks such as PHP (for use on Apache) or c# for using with asp.net and IIS.

If, however, your aim is to broaden your c/c++ skills and you want to build a website then you'll need to do pretty much everything from scratch yourself. You'll need to know socket programming so you can listen for requests and respond to them, probably multi-threading to make it work smoother. Then you'll need to learn the HTTP protocol so you can understand the requests browsers make and how to construct the appropriate response to send back.