Some of the web addresses, URL's, have changed with the site re-organisation. This means that certain sections, like the Tutorials as were on the old site, don't exist in the same locations.
As gigi says, the best place to look now is in the FAQ section. Many of the old tutorials have been rolled into this section.
For example, I remember that Bruce wrote a very handy tutorial on how to re-size a picture. When I put re-size into the FAQ search I got:
Many thanks. I'm glad it's the URL's that have changed; I was beginning to think my computer had gone mad. The link in Santy's message worked fine, so I guess that is the answer. I thought there might be a "Tutorials" button somewhere to click, but perhaps FAQ is the answer.