Allow people in Slack to create a helpdesk ticket in a 3rd party system using a Slash Command and a Dialog.
Allow people in Slack to "clip" messages and save in a 3rd party system using a message actions and a Dialog.
Allow people to post announcements to a restricted channel from time to time, with admin approval.
Learn how to create the App Home view and use the modals
Learn how to design an expense reporting app using home tabs, modals, and messages.