In fact with MoodleCloud you can practice the teacher role and the Moodle administrator role. up to 50 accounts free. The limitation is that you can not try any plug-ins which are not already there. Visit the forum dedicated to MoodleCloud https://moodle.org/mod/forum/view.php?id=8277.
Also visit https://learn.moodle.org/ for teaching part. About Moodle administration there was this recent discussion: https://moodle.org/mod/forum/discuss.php?d=391805.
System/server administration is a different story. I don't believe you learn that on Cpanel. On Unix/Linux it is the command line interface.
Installing and upgrading help
Unable to generate kid and privatekey
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