Two heads are better than one
Definition 1 of 1
Pro Tip 1/3Collaboration Importance
The phrase emphasizes the advantage of collaborative effort over individual work. 
To complete the group project efficiently, remember that two heads are better than one.
Pro Tip 2/3Idiomatic Usage
It's a figurative expression, not implying literal heads, but rather people's ideas and efforts. 
In this chess tournament, two heads are better than one, so let's team up.
Pro Tip 3/3Problem-Solving
Use this phrase when discussing strategies to address challenges or obstacles. 
This code is buggy. I think two heads are better than one to debug it.