Discord and Slack are two different application but they both use the same idea. They allow people to talk in real time. In case you are an old school person, imagine IRC but with gui 😉 Like mIRC hehehe. There is still #powershell channel i believe on irc network though. Most people went with time, and switched to Slack or Discord. Those two apps are sort of ‘connected’. When logged in one, you will see messages received from users logged in the other app due to bots i believe. On the discord you can also use the voice/video rooms, where one can stream etc / talk using microphone.
Where do i go now ?
You will probably be lost and confused in the begging, your safe best is room #powershell-help , where people ask powershell related questions. Later on, you will notice that there are many other rooms that are topic/project related. Try to ask question/write in those specialized rooms if you want relate to specific project. You can access the discord server via this link https://discord.gg/6EGvU9S
You can find the slack portal here : http://powershell.slack.com/ . It is quite similar to discord, but has its own quirks. In order to add the room first you have to add it using the plus sign.
On the right side you can find details button, which would bring you to this windows
You can check the About meta, check who is on, pinned messaged and so on. If you are looking for a PowerCLI specifc slack you can find it here.
Old slack / discord – Internet Relay Chat
In case you do not want to use those new fancy, gui software 😉 you can still access true good old IRC #powershell channel in irc.freenode.net, either with your favourite client like BitchX,Irssi,mIRC, XChat or just a web browser here: https://webchat.freenode.net/ . Not sure if there are more specific groups than just #powershell on ircnet.