Links are built with the <a> tag. href is where it goes, and target="_blank" is for opening a new tab.
If you're opening an external link in a new tab, it's good practice to add rel="noopener noreferrer" for security. A link is like a signpost for the website — make sure it points somewhere right.
html
<a href="/about.html">About Us</a>
<a href="https://www.wikipedia.org" target="_blank" rel="noopener noreferrer">Visit Wikipedia</a>
<a href="mailto:info@example.com">Email Us</a>You should see
You'll see three kinds of links: internal, external, and email.