Via my colleague VP who I'm working with to help build an Oracle By Example course around OVD and Oracle Access Manager - I learned we've got several new courses around learning how to use Oracle Enterprise Linux (OEL).
As you may know OEL is Oracle's new offering that at least in my personal opinion provides two things:
1 - Alternative network to get patches for Red Hat Enterprise Linux (or if you are starting from scratch, you can install Oracle Enterprise Linux which is very similar to RHEL)
2 - Ability to get Linux support from Oracle support
Also according to our Linux training page it appears you can now get an Oracle Certification around Linux.
So if you have been looking to get more details on Linux and/or more hands-on "in the dirt" with OEL without wanting to have to install the distribution, I think these courses might be very well up your alley.