www.wysiwygwebbuilder.com

I think I am not compliant with,

GDPR, CCPA, LGPD and POPIA rules and laws

Sometimes when I go to a site they display a notice to the user for privacy and cookies

usually, this notice will pop up at the beginning of browsing the website.

Is there anything I can read about how I can do this?

Maybe this?
https://wysiwygwebbuilder.com/cookiebubble.html
https://wysiwygwebbuilder.com/cookieconsent.html
https://wysiwygwebbuilder.com/cookiepolicy.html
https://wysiwygwebbuilder.com/cookiebar.html

or else just a dialog:
https://wysiwygwebbuilder.com/dialog.html

Thanks.