sls deploy command deploys your entire service via the Fn API. Run this command when you have made service changes (i.e., you edited
serverless deploy function -f my-function when you have made code changes and you want to quickly upload your updated code to your Fn server or cluster.
This is the simplest deployment usage possible. With this command Serverless will deploy your service to the configured Fn server.
-vShows all stack events during deployment, and display any Stack Output.
deploy function(see above). Convenience shortcut