What is disto?
A distro is the variant of linux you choose. Some are optimized for servers, some are optimized for general desktop use.
For beginners, Linux Mint is where I would suggest starting. It feels familiar to a Windows user and is specifically designed to be beginner friendly.
There is a detailed install guide here. But the short version is:
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Click next a bunch on the installer. If you don't have anything on the computer already, choose to have it wipe the drive and install Mint as the only OS. That greatly simplifies things.