At its most basic, simply place your WAR file in the webapps directory of your instance. See Deploying Applications for the details. However, if you stop here, your application will only be accessible ...
Like other Java enterprise tools, Tomcat has migrated from the original Java EE specification to Jakarta EE. Tomcat 9 and earlier were based on Java EE; Tomcat 10 and later are based on Jakarta EE.