I found thing 4 (Research Data Discovery) very useful as I have not previously looked at re3Data.org - the Registry of Research Data Repositories, and only cursorily at Research Data Australia (RDA). So my familiarity with both of these has increased substantially.
I found this brief article. "How to find an appropriate research data repository?" a good introduction to re3data.org.
It was interesting to see that Australia had 63 repositories registered while China had much less. I can offer no inferences on this, I was just surprised. I was pleased to see that Trove is included as a research repository in RDA.