Answer 1

You managed to make five mistakes in five tags.
Maybe you should stop watching YouTube and start taking a CSS course, and at the same time repeat the html course?

<a href="https://www.youtube.com/watch?v=wRIHB0sByB0"
1. You didn't close the <a> tag
👇
target="_blank"><b>Link To Tutorial</b></a>
<div class="container">
2. <div class="dot dot1"></div>
3. <div class="dot dot2"></div>
4. <div class="dot dot3"></div>
5. </div>