[Solved] Biggest mistakes beginner writers make?

There are several mistakes that beginner writers make. Writing is also one of my core skills, and I have written dozens of articles myself. 

When I was starting out, here are some of the mistakes that I also made: 

• Writing without first understanding the client's goals or target audience.
• Focusing too much on sounding smart instead of writing clearly and simply.
• Not properly understanding the various types of writing.
• Skipping proper research
• Weak headlines
• Poor content structure
• Long paragraphs that are hard to read
• Ignoring SEO - when it's relevant.
• Weak understanding of English grammar - especially capitalization, punctuation, etc. 
• Weak proofreading and editing, which caused me to make so many grammatical errors in my articles
• Focusing on myself instead of the reader.

    and so on... 

But with time, I kept on refining my craft, and I eventually became a much better writer. So, the goal is to keep getting better constantly! 

Hmm, I just noticed where I have been making mistakes. 

Thanks for your response.