There are lots of things to learn about cryptocurrency, and they need to understand a lot of things when it comes to internet Business, since cryptocurrency is part of the internet. You need to let them know about scam just like some have pointed out here, it's really important. And they should also understand how the transaction works and know everything about fees.
Moreover, why I am pointing out that they should know about the online scams there is, is so that they will be able to stay clear from it and not make mistakes. This is a really long story, you should do the research and you should add it to your lesson plans.
If some of your student interested, don't forget to tell them to backup their seeds or private key.
This must be a basic and foremost step for any internet activity. People need to remember their password when they create their new email ID and then the password is something too long and in unreadable format then they must go for taking proper back up. Same applies to seed and private keys.
If you are not familiar with basic internet things, then honestly bitcoin is not at all for you. You must get familiar with all pre-cautionary measurements of internet first and then you must take time to study about bitcoins and how to invest and how to securely save bitcoins and then only you must go for buying your first bitcoins.