Organize your content so that your website is easy to navigate. Use hyperlinks to articles on your own website and to other helpful sites. Do keyword research to determine what keywords people are likely to use to find your content. Sprinkle your content with those keyword phrases, paying particular attention to your article title, headings and your leading paragraph. Provide alternate text descriptions for your images (Google loves knowing what images mean).
Quick turnarounds. When you write for an employer, on their timeline, you will need to be able to write fast and write well. This is especially true for writers just breaking into content writing. Often, your project will come with an expected words per hour, or article per hour, as well as strict deadlines. You will not have time to labor over every word or turn of phrase. Instead, you will need to produce content fast and at a constant rate.