Ok, one thing I know is that I NEED to build up links for my site. But at the same time I understand they need to be related links. So whats the best approach to build site related links for a motorcycle forum? And does it hurt to have non-related links?

I managed to take my site from PR-0 to PR-4 in the last update thank to some advice from members of dnf, but the whole link thing seems to confuse me.

Thanks