Slack Slash Commands
1. @everyone
This is command is used when you want to get a message to everyone on your workspace, not just in a single channel. Since the message reaches to everyone, you can only use this command in a team-wide channel. Also, the message will be delivered regardless of the user status like online, offline, busy, away, etc.2. @channel
While @everyone is used to mention everyone in your workspace, @channel can be used to send a message to everyone in a specific channel. The message will be delivered regardless of the user status like online, offline, away, etc. If a user is not a member of the said channel, he or she won't be notified of the message.3. @hear
You can use this command when you want to notify all the currently active members of a channel. In case you are wondering when a member is actively using Slack, you will see a green dot next to their name.4. /dm or /msg
You can use /dm or /msg to quickly send direct messages to a user in your team no matter on which channel or user screen you are on. While using this command, you don't have to manually select the user from the Direct Messages list and then send the message. Instead, all you have to do is type /msg @someone <your message> and press Enter.5. /me
This is a very simple command. When used, it will display italicized text. For instance, if you type /me let's go to lunch, Slack will display let's go to lunch.6. /remind
This is a very useful command that lets you set reminders within Slack. The syntax for setting up a reminder is very simple, it looks something like this: /reminder @someone/#channel [what] [when]. For instance, if you want the Slack bot to remind you to drink coffee at 4 PM then the command will look something like this./remind @me drink coffee at 4 pmObviously, you can set more complex reminders like recurring reminders, message reminders, reminders for specific dates, days, time, alternating weeks, etc. You can know more about how to use the Remind command in Slack from here.