during installation, the first time access appears like this, what does that red cross mean for me?

The first three red X's are PHP extensions that you need to enable in your php.ini to enable them.
The first is required to fetch email to make emails into tickets.
The second is required for API stuff.
The third is for HTML email processing. (If you want to receive HTML emails)

The fourth X is caching. You do not need this for anything other than possibly speeding up performance of your site.

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