There are very few rules, but here are the ones I have:
1) You can link up any post that you wish, but the URL must lead to a post and NOT to your blog home page.
2) Please try to visit and comment on as many other linked-up posts as you can (one is better than none!), and please leave #SundayBest on your comment so the blogger knows that's how you found their post!
3) Please add the Sunday Best button on your blog homepage or your blog post - the more the linky is shared, the more people link up and the more we can all interact!