How Can I Link Old Content to New Content?
 

it is better to set 301 redirect for old to new

This gives your new article a little support and it likewise googles to discover it. As Google is re-ordering your substance, it will take after connections inside your posts.Revisit your more established posts and discover posts you ought to be cross connecting. Consider including this as an extra thing to your agenda for new posts.

I usually don't link old and new content together unless is really, REALLY relevant.

I tend to like more to update old articles and make them relevant again, then link to this "new" article.