Pin important docs to individual channels
Rather than search to retrieve documents you're regularly working off of, you can easily pin them to the top of a channel. To do it, hover over the shared document or item you want to pin, click "Show message actions," and select "pin to this conversation" or "pin to this channel."
Set reminders and automatically create to-do lists
When you star a message in Slack, it gets archived in a section accessible via the star icon in the upper-righthand corner of the app. This is not only a smart way to file away messages you know you'll want to retrieve on a regular basis later, but can also function as a de facto to-do list. And if you want to set a reminder about anything, it's easy: in the Slackbot message box, type "/remind" and include the who, what, and when.
Know how to pull off an advanced search
When you're trying to locate a random message from a while back, poring over thousands of hits via a straightforward search is going to be a pain in the ass. Thankfully, Slack provides a wide swath of advanced search methods.
Know the keyboard shortcuts
Slack can save you tons of time during the day if you're using it properly, but to fully unlock its potential you've gotta master the keyboard shortcuts. Scope out the full lineup by pressing "command /" with the desktop app window.