I think what you are referring to are updates to Linux operating system, not to Oracle E-Business Suite. You should not be worried about updates to the operating system, if your core focus is to learn the functionality of Oracle E-Business Suite. If you are interested in upgrading your Oracle E-Business Suite (e.g. from 12.0.6 to 12.13 etc) then you should consider reinstalling a newer version on a separate virtual machine. Upgrading Oracle E-Business Suite is a lengthy technical procedure that will take away your focus from learning the functionality. It is very easy to get distracted if you are not focused.
If you are facing errors while trying to replicate what you have seen in videos, then post the error messages preferably with screen shots.