Tips for Better Writing
I doubt that there's one particular "secret" to good writing - there are, however, lots of tips that can help to make you a better writer. Here's a few of my faves:
Set up a schedule to write regularly and keep to it, whether it's daily, twice a week, whatever. Just do it. Practicing a skill is how we improve.
Write about those things that you personally know about. Don't try to fake your way through a topic by reading a bunch of other people's words and then just throwing some paragraphs together. Learn your topic thoroughly first, to the point that you can speak about it as if having a conversation with someone about it.
PROOFREAD - have someone else read your writing before you post it out there for the whole world to see. If's often very hard to catch our own mistakes, while a different set of eyes can usually pick up an error easily.
Be careful not to overuse phrases or keywords. Try reading what you've written out loud - if it sounds stilted or choppy, you're probably using the same phrases and keywords too often. Beating your reader over the head with keywords is not going to get them to pay attention, it's just going to annoy them (and the search engines as well.)
Read. Read more. And then read some more. The more often you see how successful writers construct their works, the more likely you are to write better as well, as your mind becomes more attuned to proper structure and phrasing.
Have fun! If you enjoy your topic, it will come through in your writing, so get fired up!