Running the latest Liferay CE is straightforward:
LIFERAY_HOME/tomcat-x.xx.xx/bin/startup.sh; only on Windows environments run the script
firstname.lastname@example.org, and the password
LIFERAY_HOME/tomcat-x.xx.xx/bin/shutdown.sh; only on Windows environments run the script
With these steps, you will have Liferay up and running in a "demo" mode. Liferay will use an Hypersonic DB by default, but it is unfit for production. Also,
email@example.com is an administrator account with a default password, so it should be changed eventually. Yet, these steps are good to get some idea on how Liferay looks like and works.