How Publishing Really Works is a blog I always enjoy for its perceptive views on writing and the publishing industry.
Today's post on the importance of reading is spot on. Whilst I do think writing can be taught, at least to an extent, reading widely and in more than one genre is also critical to both new and experienced writers. A taught course or even a how-to book will inevitably reflect the personal views and style of the teacher. However, a depth of reading will introduce writers to a huge array of styles and subject matter, which can improve their own work as they discover what works for them as a reader.
So get books for free in the library, buy them cheaply in a charity shop. Experiment with books you would never normally choose. If you don't like them by all means give up, but not before you've worked out what you don't like. It can only improve your own work.