Windows: Press Win + I
Windows: Go to System > About
Windows: Check Device specifications and Windows specifications
Windows: Press Ctrl + Shift + Esc
Windows: Open the Performance tab in Task Manager
Windows: Press Win + R
Windows: Type msinfo32 and press Enter
Windows: Type dxdiag in the Run box and press Enter
Mac: Click the Apple menu
Mac: Select About This Mac
Mac: Review the Overview tab
Mac: Open System Settings > General > About
Linux: Open Terminal
Linux: Run lscpu
Linux: Run free -h
Linux: Run lsblk
Linux: Run sudo lshw
Linux: Run inxi -Fxz