Creating a second “pages” section

I am fairly new to wordpress and have managed to modify a theme to my current liking mostly through trial and error, and I don’t have much knowledge of code.

However, I would like to add a second section in dashboard that functions in the same manner as the original “pages” section. The pages I have created, are accessible through the header menu, which is how I would like to keep it. I would like to add more static pages that appear in a second section in the sidebar.

For reference a link to my homepage is https://www.missouri-fishing.com