If it is a plugin you just SFTP (see Filezilla) from the one site to another. Let’s say local host to Web Server. The plugins are in the dir
/wp-content/plugins/<my plugin>,
just FTP to the Destination, then enter to the Dashboardof Destination Plugin and Activate & Configure.
Another way is with Git, you local installation is needed to update your Web installation , as two Git repositories. Transfer what is needed,
NOT TRASFER the wp-config.php (includes passwords)
