I noticed you gave the article element an alt attribute, that's a mistake a guess
<article alt="" />
<img src="logo-front" alt="Photo of coding guy from unsplash">
<h1>Coding is tough</h1>
</article>
Haha, I definitely made some of these mistakes as well. I can totally relate.
Yahaya Oyinkansola
PHP Developer
The one I really got to learn about is putting block elements inside inline elements is wrong, never knew this so Thank You, an amazing article