The Digital Education team provide a range of UCL specific Moodle guides here. You can also browse the official Moodle guides at Moodle.org.
The New Features page lists all the latest functionality you can use with Moodle.
If you are looking for information about other e-learning tools aside from Moodle and Turnitin please see the UCL E-Learning website.
Please also have a look at the E-learning Wiki for a whole range of more pedagogically focused e-learning articles