Pinning a Tweet allows you to highlight a specific Tweet at the top of your profile page, making it the first thing visitors see. This can be useful for promoting important announcements, showcasing your best content, or sharing time-sensitive information.
To pin a Tweet, simply click on the three dots icon in the top right corner of the Tweet and select “Pin to your profile page.” The Tweet will then be moved to the top of your profile and will remain there until you unpin it