I see some other blogs that has homepage and they put some sub domains link to their homepage. Also they can configure it so flawlessly as if they not into a free blogging site.

Do you know how they do that?

blogs are websites!

they not into a free blogging site

Maybe they aren't! Not everybody are cheapskates and use free resources totally.

Chris is right. I dont think the sites your on about use free resources.

I have seen a few where they have set up a subdomain blogg.this-site.com and others where they have just created a blog page this-site.com/blog.html. and then used their site template/theme.