I need to reset my iphone but cannot remember my passcode

See the Apple Support article(s) below.

Passcode - If you forgot the passcode for your iPhone or your device is disabled.      

It must be reset in Recovery Mode.

If you use a PC, download iTunes from the Microsoft Store. If you are using a Mac, you can just get started.

If you have an iPhone 8 or later.

1) Turn on your iPhone

2) Connect it to your PC or Mac

3) On your phone. Quick Press Volume UP, then quick press Volume DOWN, and then press and hold the Power Button until it starts up in Recovery Mode. You will see a black screen with a computer and cable icon.

Now you have the option to press Restore on your PC / Mac. Your phone will be restored to the factory settings and EVERYTHING will be deleted.

You're welcome. Good luck.