I usually find that it's easier to learn something when I have
a goal in mind. Perhaps creating a plug-in would be a good
version of such a task. Such a task isn't any kind of substitute
for a good tutor OR actually spending some time with the
tutorials, but it *does* focus the mind.
Writing plug-ins comes a bit more easily to me than it did
N years ago, but I wrote this thing and people still appeared
to find it at least amusing, if not useful. It's been recently
updated to reflect the new, easier rubrics for creating
plug-ins. It might be useful. Or not.