Use BIOS/UEFI hardware monitor
Install a temperature monitoring app
Check CPU temperature
Check GPU temperature
Check motherboard temperature
Check SSD/HDD temperature
Use built-in Windows tools if available
Use manufacturer software for your CPU or GPU
Set up alerts for high temperatures
Monitor temperatures while gaming or under load
Compare readings at idle and under load
Keep the PC case clean
Ensure fans are spinning properly
Check fan speeds in monitoring software
Improve case airflow if temperatures are high
Reapply thermal paste if needed