I forgot my password of my apple id

Click on this link to read what to do "If you forgot your Apple ID [Account] password" --> https://support.apple.com/HT201487

or go directly to this link --> http://iforgot.apple.com/

Also read about "What to do after [or before] you change your Apple ID email address or password" --> https://support.apple.com/HT204071

If you still need help:

Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues." --> https://support.apple.com/HT204169

Go to settings> Password and security>change password(that option would be on top) first see if you have two factor authentication on then you can change it from there too and you can still change the password if you have any other security type setup

For that you have to answer security questions that you setup by yourself