I use Slack everyday to communicate with my team on their day-day as well as important announcements to the team.
It has never went down and it is easy to use; especially because you can connect apps for more optimal management.
I have used Notion since high school and have always loved the design, storage and customizability of pathways for optimal results when managing your data.
If you need a place to store company documents/plans or school projects & writeups, Notion is a great option.
