I think the link to the SitePoint Article – Handling Form Actions in WordPress on Lesson 1.3.07 should be a target=”_blank” one. It took me to the site and I lost my place in the video. 🙁
Actually, all the external links on 1.3.07 need this, I think. Every unit up until 1.3.07 opened external links in new tabs, so it was definitely unexpected behavior.
I don’t think it matters whether they are internal or external but I do think it should be consistent throughout the course (which I am *really* enjoying, btw!).