Can't login to Acer laptop- forgot the password.

Hello Anna, 

The tutorial below can help show you how to reset the password of an account in Windows 10 depending on if this is for a local account or Microsoft account.

Option 4 or 5 is good for when you are unable to sign in to the account or have another administrator account to sign in to change the passwords.

https://www.tenforums.com/tutorials/14699-reset-password-user-account-windows-10-a.html

I have an acer 511 series labtop an forgot my user password but dont know exactly what is it in the beginning of when you turn on the labtop which password is it called?

This confirms that you are truly the owner of your pc.

Basically, a local account is an account like you have with Windows 7.

A Microsoft account uses an email address, and is like a roaming account allowing you to use Microsoft services such as OneDrive, Microsoft Store, OutlLook, etc....

The tutorial below can help provide more details.

https://www.tenforums.com/tutorials/5387-how-tell-if-local-account-microsoft-account-windows-10-a.html

See also:

https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/local-accounts

https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/microsoft-accounts

What's the difference between a Microsoft account than the other?