What does "account" mean?
You will learn what an online account is in plain words.
An account is your own space on a website or app.
It saves your name and your stuff. So it knows you next time.
You make one by signing up with an email and a password.
For example, an email account holds your messages. That is an account.
Never give your account password to anyone who asks.
Buddy says
Keep your password private and safe.