My first post but I have been lurking for a while and have read a lot of the useful information here!

I would like to have your opinions on what on-page factors contribute to a good quality link. I have read that too many outbound links will dilute the quality of the link and that the page topic should be related to the linked-to page. Are there any other factors do you think? Like keywords in the title or in close proximity to the link for example?