How do I make sure no one else has my Apple ID amd password and if they do hiw do I get rid of them from my I fo

In addition to changing the password, you can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.

Link to contact Apple Support in the article.

Apple ID has been compromised.      

Security and your Apple ID.      

 Apple ID Password Change.     

Note the restrictions in the article.

Apple ID Name Change.        

 What to do after you change your Apple ID or password - Apple Support    I suggest doing this before you change your Apple ID or password.

Apple ID -Two-factor authentication          

Two Factor Authentification availability.    

2 Factor Authentication - How to generate a recovery key

Apple ID - Using app-specific passwords.     

Apple ID - Two Step Verifications FAQ    

Dadadabo wrote:

I am positive someone has access to all my data thru knowing my Apple ID and password Zzz. How do I for sure know no one is spying on my new iPhone 12 ?

Change your password.