To start of, I am fairly new to encryption and SSL, but I am working hard to get some knowledge and appreciate every attemt trying to help me.

Today I googled a bit (read some atricles about security) and encountered the site
[https://cacert.org][1]. I clicked it and was surprised. Chrome showed me a "not trusted" error. The SSL certificate seems not to be valid. I looked up the certificate and it shows me that the certification agency is not trusted anymore. I got some questions now:

 - Isn't CAcert a certification agency itself?
 - Why is that?
 - Could this be some kind of attack approach? (MITM)
 - What can I do?
 - Where can i get more information?

Thanks for any help!

  [1]: https://cacert.org