Forgot MacBook password and lost installation disc

Depending on the build model year and how the operating system

was installed, it may/or not be able to use online recovery methods.

And vintage of macOS &/or Mac OS X makes for different choices.

Change or reset the password of a macOS user account - Apple ...

Change or reset the password of a macOS ... with the Apple ID password

that you use ... on your Mac to shut down and start up again in Recovery OS.

https://support.apple.com/en-us/HT202860

•Five Ways to Reset a Lost Administrator Password - TidBITS

... and double-click the icon for the Recovery partition. A Mac OS X Utilities ...

your Apple ID password, ... Ways to Reset a Lost Administrator Password

https://tidbits.com/article/14437

•How to Reset OS X User Account Passwords

How to Reset OS X User Account ... any user account password on your Mac.

...your user account password, in OS X, is with the Apple ID that the you ...

https://computers.tutsplus.com/tutorials/how-to-reset-os-x-without...

•Mac OS X (10.6 and before) - Resetting a Forgotten Account ...

Resetting the Password. To reset a Mac OS X account password, startup the

mac using an Apple Software Restore disc (included with newer Macs) or a Mac ...

https://kb.wisc.edu/helpdesk/page.php?id=3853

About macOS Recovery - Apple Support

... (or Reinstall OS X): Download and reinstall the Mac ... for your Mac. Links

to Apple's ... macOS Recovery. Newer Mac computers and ...

https://support.apple.com/en-us/HT201314

The use of macOS Recovery from support article pages, can be helpful once

you determine what you need to do there ~ just so as to get only that done.

Without knowing the version and vintage of operating system, some of these

may be better choices than others. ~ An older machine that has seen upgrade

via downloaded system - Lion 10.7.5 or Later - may use macOS recovery.