Spellcheck. A simple one to start with. There will always be some words to reorder. Some errors that have slipped through the net. If in doubt, ask a meticulous colleague.
Simplify. This isn’t dumbing down. Just make your points clearly and concisely. Read it aloud and fix the points that stick. Then double check and run it through: www.hemingwayapp.com
Structure. Even a perfect post may still be hard to read online. So check that the main points of your content are easy for your readers to scan. Use titles and bullets wherever possible.