CMD (en)

 What is it? : 

Do you know systen program cmd.exe? If not, try it. You can do many advanced things with that. 
It's something like system DOS. Just write a command and that's it. For wiewing all the command type help. 

How to run it? : 
Click on the start and click run, than just type there cmd.exe. 

More commands: 
In commands when typing help,aren't all of them, here are some more: 
ADDUSERS - Add or list users to/from a CSV file 
ARP - Address Resolution Protocol 
ASSOCIAT - One step file association 
BOOTCFG - Edit Windows boot settings 
BROWSTAT - Get domain, browser and PDC info 
CHANGE - Change Terminal Server Session properties 
CHOICE - Accept keyboard input to a batch file 
CIPHER - Encrypt or Decrypt files/folders 
CleanMgr - Automated cleanup of Temp files, recycle bin 
CLEARMEM - Clear memory leaks 
CLIP - Copy STDIN to the Windows clipboard 
CLUSTER - Windows Clustering 
COMPRESS - Compress individual files on an NTFS partition 
CON2PRT - Connect or disconnect a Printer 
CSCcmd - Client-side caching (Offline Files) 
CSVDE - Import or Export Active Directory data

IPCONFIG - Configure or get you IP adress

There are loads of more commands and I don't want to write here all of them. Other commands are here (But some are only in the help):https://ss64.com/nt/

When you want for example creat new folder, type command (MKDIR), space and name of the folder. If you want to change direction where the folder creates (or directin of almost every command), you have to type CHDIR, space and directin.

When you want to rename some file, type RENAME and don't type direction like "C:\Program Files\blabla.jpg", but first type CHDIR, space and "C:\Program Files" and than "RENAME blabla.jpg huhu.jpg" (The first is the name of file being renamed, the second one is name, which you want the file to have.)