Here’s a link to an online version of the code. It can come in handy when writing chemistry or having to check out some cargo handling stuff.
https://www.marineatlantic.ca/imdg12/contents
Edit: I just noticed that sometimes you don’t have access due to too many users.
The Marine Online Channel has some interesting stuff on Youtube as well.
IMDG Code
Transporting Dangerous Goods
Consignment Procedures