redirect root to subdirectory - best practice

It looks like what you want to do is create a redirect in Apache. We have a guide on doing this on our website:

Redirect URLs with the Apache Web Server

Essentially, in the Apache configuration, specifically the vhost file, you'll redirect users from one site to another. Should you be concerned about SEO, then you'll want to consider the type of redirect you're making. If this is a permanent move, then you'll want to do a 301 redirect. If this is just a temporary change, you'll want a 302.

thanks,
its half work, now every page i am visiting (not only the root) redirect me.