You must learn how to protect the information stored on your computer. Eventually your computer will break down. When it does, you will want to easily recover the lost information from other sources. The best way to protect yourself is to have more than one copy of all your important files. Then, when your computer breaks down, you can copy your files onto a new computer and keep working.
Many programs have their own commands for creating, copying, and deleting files.
You should learn what facilities your programs have for doing these MS-DOS functions. Understanding MS-DOS helps you to better understand the programs you use. Prepares a disk so that MS-DOS can use it. Formatting a disk erases all the information on the disk, so be careful. A disk can sometimes get corrupted when, for example, the power is turned off while a program is still running.