I forgot my Mac mini login password, how do I go about resetting it. I keep getting instructions on how to reset my AppleID password, I don’t need that.

See instructions in https://support.apple.com/en-us/HT202860

See the following from that same support document:

Get more help

• To reset your password, you need to know the email address for your Apple ID. Don't know the email address for your Apple ID?
• If you still can't sign in with your Apple ID and password, make sure that you entered the correct Apple ID. In most cases, your Apple ID is also the primary email address of your Apple ID account.
• In some cases, you might be able to speed up the account recovery process or reset your password immediately by verifying a six-digit code sent to your primary email address.
• Still need help? Contact Apple Support.