Safety First magazine from airbus (available on personal devices for free, and probably on the web) is a pretty nice resource on operating airbus aircraft.
The standard airbus CBT is very shallow, not much better explaining the aircraft than reading wikipedia. However, the FCTM is actually pretty good, so go read it as soon as you can get hold of it. Learn the documentation structure, it is quite different if compared to other types, especially boeings. Especially the EFB (flysmart) version of it is on one side quite practical in daily operation and horrible for learning stuff and just reading up on several systems at once. Again, know the overall structure and it will be easier.
Another resource i used during my typerating was usebeforeflight, but it is not cheap. Still helps to do non normal ECAM drills in your downtime to get familiar with the aircraft. Preparing sim sessions with it is another great use of that software.