The Electronic Travel Authority (subclass 601) allows individuals to visit Australia as a business visitor and stay up to three months during each of the visit. Moreover, you can also study in Australia for up to 3 months under some circumstances.
You might be able to get this ETA if:
Tourist activities includes:
Business visitor activities include:
Note: Business activities do not include short-term work.
You can apply for a Temporary Work (Short Stay Activity) visa (Subclass 400), if you want to work in Australia.
To apply for an ETA, you need to have passport from one of the following countries:
An ETA is generally valid for 12 months. You can enter & stay in Australia for up to three months.