FEW IMPORTANT DOS COMMAND

1) cd
C:\cd users 
It will change the directory.

2) Cls
This command  will clear the screen.
e.g. C:\cls

3) start "program name"
it will run any program
e.g. C:\start notepad
It will run notepad

4)  dir
The dir command allows you to see the available files and directories in the current directory. In addition to listing the contents of a directory, the dir command will also show the last modification date and time, as well as the file size.
e.g. C:\dir

5) md
make directory
C:\ md bijoy
A directory will be created in C:\

6)Copy

Copies one or more files to another destination
copy [source] [destination] 

7) Move

Move one or more files to another destination

move [source] [destination]