This video series is designed to help users who may be new to Salesforce Lightning Flow, learn by comparing the similarities between Process Builder and Lightning Flow. This video looks specifically at the Post to Chatter element.
0:00 Series Intro
0:40 Cheatsheet
2:00 Use Case
2:37 Process Builder
3:32 Review the Flow and Decisions
5:12 Create Post to Chatter Action Element
7:58 Using a Text Template for the Message Text (the right way to do it)
10:38 Bonus Tip: Merge Paths
11:46 Closing Comments
Check out the corresponding blog post where you will also find the downloadable cheat sheet.
https://www.terrystidbits.com/?p=3135