When you first join, you will see everything at once, however, only some parts are interesting for us, namely the left tab where we find:
Threads: recent conversations where you started a thread, responded to one or were mentioned.
Channels section: think of them like rooms for different contexts, in this case, rooms for questions about Python, questions about Workspace or job placements, etc.
Direct messages section: where you can search who you want to message. After you have started conversations, these contacts will remain.
Within the channel
If you click on a certain channel, the main panel (image bellow) will display the activity in chronological order. You are free to message every channel and every person, but we ask you to be respectful.
In messages, you can tag people by using @ or channels by #. This way, they will be notified in the threads section. (image below, tagging a channel such as general)
You can also perform actions on messages by hovering them, such as: leave an emoji; reply; share a message; etc. (image bellow, actions on the top right)
Slack has a lot of useful functionality when writing messages, such as:
Upload documents, images, etc. in channels and conversations
Edit the text format
Make bullet and numbered points
Write code blocks
All this functionality will appear at the bottom of the text box.
Search Bar and Preferences
Slack offers you the possibility of searching for particular words, people or channels by using the upper Search Bar.
Personal preferences such as notifications settings can be adjusted by clicking on your avatar located on the top right.