anyone can reset password of my mac in Recovery mode?

If one this that concerned about Security >>>

Use Startup Security Utility to set a firmware password

Setting a firmware password prevents your Mac from starting up from any internal or external storage device other than the startup disk you’ve selected unless the firmware password is entered. You can turn on, turn off, or change the firmware password using Startup Security Utility.

When the firmware password is turned on, each time you start up from macOS Recovery or from a storage device other than the one selected in Startup Disk settings, you need to enter the firmware password.

After you restart your Mac, changes to the firmware password take effect.

1. In the Recovery app, choose Utilities > Startup Security Utility.
2. If requested, enter an administrator user name and password.
3. Do any of the following:

• • Turn on the firmware password: Click Turn On Firmware Password, enter a new password, reenter it to verify the password, then click Set Password.
  • Turn off the firmware password: Click Turn Off Firmware Password, enter the password, then click Turn Off Password.
  • Change the firmware password: Click Change Password, enter the old password, enter a new password and verify it, then click Change Password.

1. Click Quit Startup Security Utility.

Set a firmware password on your Mac

If you forgot your firmware password

If you can't remember your firmware password, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.

As KiltedTim implies, if you have FileVault enabled, they would need to know the FileVault password or the very long recovery key (which you should keep safe, or let Apple keep an encrypted copy under your Apple ID).

FileVault means never having to worry about lost or stolen Macs.

Do you have FileVault enabled?