Linking to other pages outside of your website is simple with the content editor's Hyperlink Manager.
This process creates a link within your content. If, instead, you want to create a button in your XSite's menus that links to an external web page, see the Creating Links to Other Websites section of this guide.
If you're linking to another website, it's usually best to avoid opening the link in the Same Window. By doing so, your website disappears and is replaced with the site to which you've linked. This frequently means that you lost your customer to that site.