I'm making use of leaving-it-alone-For-a-While time to sound off about the basics. Those old things; spelling, grammar, and punctuation, are abilities that we all need to have mastered to a high degree in order to write well but it has been fashionable to say: "They don't matter. Bothering about those things stifles creativity." What poppycock!
Knowing about them furthers creativity. It's only when we do know about them that we are capable of writing a sentence, a chapter, a book that says just what we want it to say effectively,avoiding misunderstandings and achieving good rhythm. What is the use of having creativity in you if you don't know how to express it?
We might all slip up occasionally but it is surprising how some people don't see the obviousness of a grammatical error. Take dangling participles, for example. (I stand to be correctred if that isn't the right term.) Here is a prime example from the recent property pages of a local newspaper (as you'll see, it isn't the only offence);
"Having worked close to the airport for a number of years this studio was always ideally located for it's current owner."
Presumably, since the flat did all the work, it was paying its own mortgage whilst its owner just used it as a convenience.
Grammar is too wide a subject to be covered comprehensively here. I would like, though, to mention an example of bad use that I believe has crept in recently from America, along with "alternate" instead of "alternative". This is "tend to", as in "he tended to his garden". No, he didn't. He tended his garden or he attended to it but he didn't tent to it. I tend to get annoyed when I hear that.
The trouble with these things is that they are accepted and repeated and fall into widespread misuse until the correct version can be considered the wrong one. In punctuation, the so-called Oxford Comma has suffered this fate. My guess is that people who care about these things were all educated before 1970.
Ah, well. Now that I've had my whinge, I'm off for some caffeine.