Windows: Press Windows key + R, type `dxdiag`, press Enter
Windows: Open Settings > System > About
Windows: Open Task Manager > Performance
Windows: Open Control Panel > System and Security > System
Windows: Open Device Manager
Windows: Open System Information by typing `msinfo32` in Run
Mac: Click the Apple menu > About This Mac
Mac: Open System Settings > General > About
Mac: Open Activity Monitor
Linux: Open Terminal and run `lscpu`
Linux: Open Terminal and run `free -h`
Linux: Open Terminal and run `lsblk`
Linux: Open Terminal and run `sudo lshw`
Linux: Open Terminal and run `inxi -F`
Check CPU model
Check RAM amount
Check storage type and size
Check GPU model
Check operating system version
Check motherboard model
Check display resolution
Check network adapter details