I have forgot my password what can I do

You HAD to use it to login and post here.

If you’re using a Trusted Device protected by a passcode - or user password on a Mac - you can reset it to something new w/o actually knowing the old password.

All options available to you are presented here … as Fox previously posted.

If you forgot your Apple ID password - Apple Support

See instructions in If you forgot your Apple ID password - Apple Support