A quality content is content that manages to be error-free and engaging. Whereas, having error-free content is only a matter of having a good command over the English language, and ensuring that your content gets proofread by a qualified editors (if compulsory), and creating an “engaging” content opens up a whole new chapter.

If a content is posted without any proper purpose then it is not as effective. We need to consider the goals of your content marketing strategy. And ask yourself what you want your audience to do when they consume your content.

For me,  the engaging content is all about getting results, such as:

• increase in traffic
• clicks
• opt-ins
• conversions
• sales
• comments
• likes
• mentions

Some other points that's improve you writing skills. Are :- 

1. Diversify your content
2. Use subheadings
3. Embrace brevity
4. Don’t overlook keywords
5. Have a voice
6. Come up with interesting titles
7. Make it shareable
8. Write stories
9. Provide facts and links
10. Have a call to action