Yes, I’m one of those people who mutters judgmental things like, “Doesn’t anyone learn proper English anymore?” while reading some of my students’ work. (And I teach mostly adults who are smart, so it’s not just kids today.) In my calmer moments I simply think that everyone should be required to take basic grammar and punctuation (or test out of it) before embarking on any more advanced writing classes in specific genres. Gotham Writers Workshop, where I teach, has a nice one-day class on the basics.
If you fear you’re at all shaky on punctuation or grammar, you can also check out the following:
The classic, Elements of Style (a.k.a. “Strunk & White”)
One Direction member Harry Styles (just kidding … except not)
ThePunctuationGuide.com’s adorable interactive punctuation guide
Steven Pinker’s The Sense of Style (for an advanced, meaty read)