The good news is that writing is a skill which can be learned like any other. One trick for checking and improving your work is to read it aloud. Reading text forces you to slow down and you may pick up problems with the flow that your eye would otherwise skip over.
Another way to improve your writing skills is to read – as you read you pick up new vocabulary and engage with different writing styles.
See our pages: Effective Reading and Writing Styles for more information.
There are a number of areas to bear in mind as you write.
As well as grammar, spelling and punctuation, it’s important to remember your audience. Always write with your audience in mind, and it can also help to bear in mind the medium in which you plan to publish. This knowledge will help you to decide whether you need to write in a formal style or a more informal one, and will also help you to decide on a suitable structure.
Finally, have a look at our page on Common Mistakes in Writing and Gender Neutral Language to help you avoid falling into some easy traps.
There is a time and a place for clichés. They exist because they explain exactly what we want to say in easy-to-understand terms. But some people find them very annoying, and you need to use them with care. See our page on What is a Cliché? for more information.