Welcome. A word of warning on online courses. I spent significant time correcting a perl course which was provided by one of the large players in this game. The test was pathetic. The answers they wanted you to select in some circumstances were impossible. The course video content was presented by one person, creation of the test was farmed out to a third party, who had no idea what they were doing. After engaging with our corporate contact to address the issues, the test was changed, with slight improvement. At the time I was working for a large Indian outsourcer, more than 34 thousand of the employees had "passed" the perl course when the test was riddled with mistakes. I've completed other courses for different technologies, I've yet to find one which was really good. So your milage may vary, just because there's a course doesn't necessarily mean the people creating the tests know what they're talking about, and people often just re-take tests selecting different answers (not necessarily the correct ones) in order to pass.

If you are new to perl I'd echo both the advice of perlintro and Mojolicious::Lite. The Mojolicious docs has other good links to get you started. As a framework Mojolicious is powerful and makes web work fun for me.