If you have materials (including student posts) on Moodle that you want to save beyond the end of this year (Dec. 31, 2017), read the how-to instructions at https://www.csun.edu/it/goodbye-moodle.
On the same page, you'll see links to CSUN Canvas Information and Faculty Canvas Support. The best news of all: if you learned Moodle, you'll be just fine with Canvas.