ping

Sends a data Packet to the specified IP Address

ipconfig

Shows current ip configuration

tracert

Trace Route. Shows how many hops (how many routers) from your current position to the specified IP address

chkdsk

Checks for system errors, drive errors and bad sectors

DISM /Online /Cleanup-Image /RestoreHealth. 

Microsoft Windows Deployment Image Servicing and Management (DISM).

Repairs the Windows 10 image.

sfc

System File Checker tool to repair missing or corrupted system files.

Scans the integrity of all protected system files and replaces incorrect versions with correct Microsoft versions.

msconfig

System Configuration Tool, can edit the startup programs