Self-paced learning material that you can work through. Some of the content is quite old and although the UI may have changed slightly the concepts are the same and the material is still relevant and useful.
Some training material may be found on the Bentley LEARNserver. Search the Leaning Path content for "All Brands" and "All Products" using the "Maxsurf" keyword.
Many videos are available on the Offshore youtube channel, these cover Maxsurf and Multiframe as well as MOSES and SACS
Below are some suggested playlists. A more comprehensive list of the Maxsurf video content may be found here