How to reset password to gain access

i put in all the passwords I used and neither password was correct. I have to reset my IMac password usIng these steps: press and hold the power button on your Mac to shut it down. Once completely shutdown, press the power button once more and then then immediately press and hold Command (⌘) R on your keyboard. Keep holding the keys until you see the Apple logo/spinning globe and you should see a page that says “ macOs Utilities” look at the top part of that page and look for the word " Utilities" now please look at the top part of that page and click the word " Utilities" and then "Terminal" You should see a box where we can type in some commands please type in this command, case sensitive and no spaces in between:

resetpassword

And then hit the Return key After that, please follow the onscreen instructions