Open access

If you want to know more about the Creative Commons there are several options available. You can read more about their mission and their licenses at their website. 

There is also lots of information to be found on the CC Wiki. Here you can both read about different aspects of Creative Commons as well as contribute yourself if you wish. The Wiki works a lot like Wikipedia. 

If you want to find CC Licensed content take a look at the Creative Commons Search Portal.

If you want to get involved, there are several ways to do so. 
There is the more formal CC Global Network with representatives widely distributed and Subnetworks for people who wish to collaborate on projects:

https://creativecommons.org/mission/global-network/ and https://network.creativecommons.org/

You can also sing up for a Slack community for everyone to meet, whether they are formally connected with the Creative Commons or not:

https://slack-signup.creativecommons.org/