While the warnings and error messages Perl gives are quite precise, they are not always very beginner friendly. In these articles you'll find some of the most common warnings and error messages you'll encounter, explained in, hopefully a more beginner-friendly way.

Some of the articles even include directions showing how to fix the error.

perldiag also has longer explanations for each one of the errors and warnings that you can skim, or you can access the specific explanation using diagnostics or splain.