I read 34 Writing Tips That Will Make You a Better Writer by Daniel Scocco from Daily Writing Tips.
I picked out five that I found the most helpful and paraphrased them.
1) Pay attention to punctuation. (I’m horrible at this and am constantly missing commas or putting them where they don’t belong. )
2) Try not to edit your first draft.
3) Learn to take criticism positively.
4) Read what you have written out loud.
5) Write like you have only 500 words to make your point.