I forgot my Apple ID and password

Have you forgotten your Apple ID?, Check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

If you forgot your Apple ID email address or phone number - Apple Support                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

See -> If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

Have you forgotten your password? -> See this Apple article: If you forgot your Apple ID password

If you forgot your Apple ID password - Apple Support

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

BTW:

You are sign in here .  .  .  with your Apple ID & Password.

Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.

You can’t merge multiple Apple ID accounts.

What happens when you use the same Apple ID & Password that you use to sign in here?

Your Apple ID is usually your email address. If you are logged into your device then you can see your Apple ID by going to settings>tap name at top of screen>look under your profile picture. Also, if signed into device, you can reset your password by going to settings>tap your name>passwords and security>change password. If you don’t know your Apple ID, trusted phone number, and don’t use 2-factor authentication then there is no way to reset it. I would suggest creating a new Apple ID and starting fresh, if that’s the case. On the other hand, if you do know all those things listed above then you can go through account recovery by visiting iforgot.apple.com.