An "About page" is where you should provide information about you as the site author, a real human being and not an AI generated character. This builds trust with your audience and supports E-E-A-T.
Page type
The "About" page should be a WordPress page, not a post.
Prebuilt patterns
You can find a number of "About" patterns in the block editor under [+] > Patterns > Feast About Page Patterns :
Schema
With the Yoast plugin installed, below the block editor, you can also change your about page Schema to "About Page":
Sidebar
The sidebar has a custom Sidebar Author Bio block with styling dedicated to the sidebar layout:
