forgot apple iphone password

If you mean the password to unlock the screen there is no way to recover it. You can reset it by restoring your phone using your computer, then restore your most recent backup. See this Apple support article for instructions—>If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

If you mean your Apple ID password you can use Apple’s password reset service—>If you forgot your Apple ID password – Apple Support

Follow this if its a passcode issue

If you forgot the passcode on your iPhone, or your iPhone is disabled

If you forgot the passcode on your iPhone, or if a message says that your iPhone is disabled, learn what to do.

https://support.apple.com/en-us/HT204306

If you mean the passcode to unlock the phone, you can’t recover it. You have to erase the phone and you will lose all data on the device. If you have backup, you can restore it after unlocking the phone.

If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support