I wasn't always good at writing at school. So I've taken it upon myself to learn more about it.
But I do believe there is always something to learn about it.
And if we understand ourselves we are half way there. That is: When you read books you start to learn what you like or don't about other people's books they have written. Ten to one if you don't like some of the ways things are written, sure enough there will be others who feel the same way as you! And that tells you not to fall into the same `trap' of grammar, etc.