This is my work.
https://codepen.io/Fansah/pen/eYdyEgm
There was some part where I felt like I don’t remember what I learned. On #13, I don’t get what I need wrong and what I need to understand.
you have to use underscores in the nav-link as well.
<li><a class="nav-link" href="#what you should know">What you should know</a></li>
it has to have the same name as the corresponding id.
<header id="What_you_should_know">What you should know</header>
capitalization matter too
I still don’t get it. I use underscores in the nav-link, and it did not work.
I did the same thing. The first character of your id is capitalized so should be in your nav-link.
#Knowing_your_yarn
#What_you_should_know
just capitalize the first letter of those two in the nav and you’ll be go to go 
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