Local channels (usually named after a city or area, e.g. #-city-name) are designed to be a hub for anyone that lives in or travels to your home. Use these to help facilitate planning (maybe start a thread to collect everyone who wants to help with the next event), share local information that may be exciting to your community, but not relevant to any other topic channel in Slack (like winning stats for the hometeam), and build a sense of community, such as by encouraging coffee meet-ups and community members from out of town to connect while traveling.
We also have a private channel, lt-agoras, where all the volunteers who are helping curate local communities are gathered in a dedicated space. It might seem counterintuitive that this channel is private, but we felt it was important to create a place where everyone shares the same goal and you don't have lurkers (as can sometimes happen in public channels). Use lt-agoras to share wins that you've had, ask questions from other Agora leads, propose ideas for the broader DEF community or just follow-along as new groups emerge.
Slack helps DEF share information and communicate openly, both as a community, and as a non-profit.
What makes Slack unique? It takes information that might otherwise be contained in an email or file folder and allows you to share and search for it across channels.
Slack is biased toward a "team first" approach, steering away from the "stovepipes as a default" approach seen in many organizations while still allow you, the individual, to manage your alerts, visibility and interactions.
Perhaps think of Slack like a modern online forum or message board, but with the ability to integrate tools and apps like Zoom or Google Drive.
Say you get a new comment on a Google Doc you shared; you can respond in a thread directly from Slack (or mark it as unread so you don't forget to go back to it later).
You can also forward emails into Slack so other can comment in a thread without blowing up each other's inboxes. Because more emails does not equal more fun.
One of the most important things about Slack, both good and bad, is notifications. We all are here to make a difference, but we are also volunteers, so where's the balance?
Check out this video from Slack for a quick overview of how to make sure you get alerted to things you care about without getting overwhelmed by pings, dings, pop-ups and messages that just aren't relevant.
Slack is a tool: make it work for you, not the other way around.