The very popular deal from https://www.ozbargain.com.au/node/240223 seems to be back (I stumbled on this and checked it out and it's available now as well). Not sure how long this is available for free.
UNSW in proud partnership with the CBA are releasing a sequence of public courses in cyber security, under the banner of the SecEDU 'Security Engineering Capability' program.
The first course started in 2016.
Register here to participate. Everyone welcome. Just bring your wits, cunning, and passion. And keep your eyes peeled for the McGuffin.
Some courses will requre C programming familiarity, others require no specific background and are suitable for those wishing to increase their understanding of cyber security. All courses require strong analytical capabilities.
These courses are largely the same as the famous UNSW University Cyber Security courses - you are welcome to learn from them and join in the community. You won't get official UNSW credit for them (unless you formally enrol as a UNSW student, and sit the exams etc) but you are very welcome to learn here for free.
SEC.EDU is a proud partnership between UNSW and Commonwealth Bank.