https://www.top-password.com/blog/reset-windows-10-password-with-sticky-keys/
https://4sysops.com/archives/reset-windows-10-password-by-disabling-windows-defender/

Run Command Prompt from Recovery Media
copy c:\windows\system32\sethc.exe c:\
copy /y c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
reboot
At login screen, tell it to restart while holding SHIFT. This allows you to boot into Safe Mode, which disables Windows Defender, which will otherwise catch this trick.
Select Troubleshoot > Advanced Options > Startup Settings. Select Restart. Choose the fourth option, Enable Safe Mode. It should now boot into Safe Mode, so Windows Defender doesn't undo the file change.
At login screen, hit SHIFT 5 times to open command prompt
Reset password: net user user_name new_password
Add new user: net user useradmin /add
Make user Admin: net localgroup Administrators useradmin /add

Offline Windows Password & Registry Editor
https://pogostick.net/~pnh/ntpasswd/
also available in Ultimate Boot CD
https://www.ultimatebootcd.com/