Channels: everything that talks to the outside — Adding and changing one
Booking pages and chat widgets are most often born from the + New menu — Take bookings and Run a help desk — which set up the table behind them at the same time. Forms, and any of the three added to a table that already exists, are born in a table's view bar, under the Channels group — open the table you want records filed into and add one there. Email In and Webhook In are set up from that same group, on their own pages. Connectors live in Integrations, API clients and outgoing webhooks in Developers, and an automation webhook is an automation with a “webhook received” trigger, created in the automation editor.
Channels itself is a list, not an editor. Every row links to the page that already manages that channel, so pausing, editing and deleting all happen where the rules for them live.