Introduction and Learning page updated

As regular users of the NT Gateway will know, we have been updating the site by introducing lots of guidance for new students. This work will be continuing as we hope to make the site ever more useful for new users. But in checking up the site today, I noticed that the general page on Introduction and Learning resources was looking very long in the tooth, with several dead links. I have now refreshed the page and updated or deleted broken links. I’ll introduce more materials there in due course.