TimeQuest recommends that you apply timing constraints to all clocks and I/O pins.
 
If the Unconstrained Paths section is red, this is most likely due to missing constraints on clocks or I/O pins.
 
You can use the Report Unconstrained Paths command to view unconstrained clocks and I/O pins.
If you find any unconstrained clocks or I/O pins
・If timing analysis is required, apply timing constraints
If timing analysis is not required, apply the False Paths constraint to avoid timing constraints.
 
For information on how to use the TimeQuest Timing Analyzer, please refer to the following document:
"TimeQuest - How to assign timing constraints"
"TimeQuest - Timing Analysis Terms and Concepts"
"Quartus® II Timing Analysis Overview - TimeQuest"
"Quartus® II Getting Started Guide - Simplified Timing Constraint Setup - TimeQuest Timing Analyzer Wizard"
A quick guide to reading and analyzing Quartus® II TimeQuest Timing Analyzer reports