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Learning to describe problems is hard, but it is an important part of learning how to code.
Also, the more you say, the more we can help!
So, let me explain opening and closing tags in HTML to you.
HTML is like a tower made of bricks. Each brick is an element.
You create most elements in html with an opening and closing tag. The opening tag marking where the element starts and the closing tag marking the element’s end. Then you can have all sorts of things between your opening and closing tag.
Opening tags look like this: <h1>.
Closing tags look like this </h1>.
the / indicates that it’s a closing tag. You have two closing tags and no opening tag in your code. Also, your first tag is an h2 while your second is and h1. They should both be h2.