To many people, the word "grammar" connotes a bunch of nitpicky rules expressed in scary terms and enforced with cruel glee. Dangling participles, split infinitives, misplaced modifiers and assertions that you can't start a sentence with "hopefully" are enough to turn most people off of the topic altogether.
But grammar is more useful than the nitpicking issues with which it's most often associated. Real grammar — the good stuff — comes when we set aside minor usage questions and focus on the mechanics that, if understood, can turn a bad writer into a competent one.
Take, for example, this sentence, which is a thinly disguised version of a real one I edited: "Supporting each other through their education and in their career dreams has been a vein running through the Wilsons' 12-year relationship that continues today as Peter pursues his dreams of becoming a medical doctor and Sarah works toward her master's."