The following is an excerpt from WordPress.org
Best Practices For Posting
You can say or show the world anything you like on your WordPress site. Here are some tips you need to know to help you write your posts in WordPress.
To be compliant with web standards for accessibility, be sure to include ALT and TITLE descriptions on links and images to help your users, such as WordPress Codex.
No one likes to read writing that never pauses for a line break. To break your writing up into paragraphs, use double spaces between your paragraphs.
If you are writing long posts, break up the sections by using headings, small titles to highlight a change of subject. In HTML, headings are set by the use of h1, h2, h3, h4, and so on. By default, most WordPress Themes use the first, second, and sometimes third heading levels within the site. You can use h4 to set your own headings. Simply type in:
Subtitle of Section
with double lines before and after and WordPress will make that title a headline in your post. To style the heading, add it to your style.css style sheet file. For more information on styling headings, check out Designing Headings.
Spell Check and Proof
There are spell check Plugins available, but even those can’t check for everything. Some serious writers will write their posts in a text editor with spell check, check all the spelling and proof it thoroughly before copying and pasting into WordPress.
Think before you post
Ranting on blogs is commonplace today, but take a moment and think about what you are writing. Remember, once it is out there, it can be seen by many and crawled by search engines; and taking things back is harder once it is public. Take a moment to read what you’ve written before hitting the Publish button. When you are ready, share it with the world.
Write as frequently as you can, may be even more than twice a day, but don’t let quantity get in the way of quality. Your viewers come for content, don’t give them useless stuff.
Don’t use too much slang
Not all the readers will be from your part of the world so make sure people can understand easily.
Consider your readers
Perhaps this sounds weird, but consider who needs to know about your blog before you tell them about your new blogging hobby. Will you be able to write freely if you tell them? How much should you let your readers know about you? Is it ok if your boss or girlfriend reads your posts? If you don’t want them to read, take anonymity measures accordingly.
Make use of comments
Comments let people share their ideas. Sometimes, they might not be good, but you can ask such people to shut up. Most of the times, they will and if they don’t you can delete their comments. Blogging like real life, can be both fun and not so fun at times. Be prepared. Also, give your people a place to contact you in private if they want to write to you.
Worry about blog design later
Blog design matters, but only to an extent. Don’t give up on blogging just because the design isn’t coming up as you’ll like it it to be. Sooner or later, you’ll get around the design problems with ease. But continue writing. Content is what attracts your readers, not just the look of your blog.
Use pictures and videos
They make the pages colorful and viewers get to see a little of your part of the world. They feel connected.
Save your posts
Save your posts before you press the publish button. Anything can happen with your computer or with an internet connection. You don’t need to lose your post.