Upon installation of Drupal Commerce Kickstart, A warning prompt shows up.

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After finishing installation. My site looks like this.

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The site is a mess, images were non-existent. It's ugly compared to the expected output like the image below.

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Probably it is because of the warning messages during installation. How will I fix the error below:

file_put_contents(public:///.htaccess): failed to open stream: "DrupalPublicStreamWrapper::stream_open" call failed File /var/www/html/pizzago1/includes/file.inc, line 496

I am willing to do the installation again just to make my initial website look, not a mess. How will I fix this?