LAB: Certificates
Go to an https website of your choice, click on the icon immediately to the left of the URL, and navigate your way to downloading/exporting the website's certificate.
Given the certificate (say, carleton.edu.pem), run this command:
openssl x509 -in carleton.edu.pem -text
Go back to that browser icon and get the "root" certificate and run the openssl command on it.