Basic Windows command

Dir - Directory listing in the directory
mkdir - make a new directory
rmdir - remove directory
del - delete file a specific file
copy - copy a file from one location to another or make a new copy of the file
xcopy - copy an entire directory and files
ren - rename files in the directory
type - display the content of the text file
tasklist - view a list of running processes (it provides the current of the process and info on the active application)
taskkill - terminate a process
ipconfig - provides details on the network configuration like ip, subnet mask, gateway and mac address
ping - check network connectivity
nslookup - get information about the domain names and ipaddress
netstat - check active network connections
shutdown - restart or shutdown a system
sfc /scannow - system file checker (/scannow option will scan for corrupted file and fixes them)
chkdsk C: - check and repair disk error on the C drive
systeminfo - gather detailed information about the system
taskschd - schedule tasks and automate processes and applications
gpupdate - force group policy update
net user - manage user accounts
net localgroup - control user groups
assoc - associate file types with specific programs
attrib - change attributes of the file (attrib +h test.txt - make the test.txt file hidden)
format - formats a disk
tree /fe - list the directory structure in tree format (/fe - includes the files)