Welcome to Palo Alto Networks.
There are a few options here so I'll list them.
Official support, you go the the link in the upper right "Get Support" and from this page you can request an account that ties to your company and equipment. This will need to be on your work email address where the equipment was purchased.
For security noticies you can review those here.
There is also a general marketing and technical blog update mailing list where you can manage your preferences here.
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