Read. Everyday, whenever you have a bit of time, read. Not just anything, although that is good for a different reason, but the kind of writing that you want to do. If you want to be a journalist, read newspapers and magazines. If you want to be a novelist, read novels. If you want to be a poet, read poetry. Not just a little, but a lot. Get to know different styles of writing. Read works by great writers that you can model your writing after. Yes, I believe a lot of what you learn as a writer can happen by osmosis–in this case, just reading a lot of excellent writing–because you remember a bit of what you read (if your memory is better, you’ll remember a lot!), and what you remember will seep into your writing. But don’t just read excellent writing. Read the really bad writing too, and those in between. If you can distinguish the bad writing from the good writing, you’ll be able to apply that to your writing. You will know when your writing is good and when it is bad. You will learn how to avoid the bad writing and write better. I’m willing to bet that no good writer ever became good at writing without having reading a lot. What are you waiting for? Go get something to read!