Click on this link to learn how to change your Apple ID password --> Change your Apple Account password - Apple Support
This is how you change your Apple ID password on your iPhone, iPad, iPod touch, or Apple Watch:
1. Tap Settings > your name > Sign-in & Security.
2. Tap Change Password.
3. Follow the onscreen instructions to change your Apple Account password.
Forgot your password? Go to --> If you forgot your password and can’t sign in to your Apple Account - Apple Support
4. If you have multiple devices signed in to your Apple Account, you’ll have the option to remain signed in or not. Tap “Remove Other Devices” to require signing in again on those devices, or tap “Keep All Devices Signed In”.
On a Mac:
1. Choose Apple menu , then System Settings.
2. Click [your name], then click Sign-In & Security.
3. Click Change Password.
4. Enter the password used to unlock your Mac. Then follow the onscreen instructions to change your Apple Account password.
You might be required to wait one hour before changing your Apple Account password. Learn more about Stolen Device Protection [ About Stolen Device Protection for iPhone - Apple Support ] and when a security delay might be required.
If Apple tries sending you a verification email and you do not receive it, read this support article --> If you didn’t receive your Apple Account verification or password reset email - Apple Support
"When you make certain updates to your Apple ID, we’ll send you an email to help you complete the update. For example, you might have reset your password, reset your security questions, or added a new email address to your account."