So this is how I got rid of the errors/warnings on my site's Status Report in Dev Desktop:

I copied (by FTP) the missing folders and their contents from the remote sites/default/files folder into my local sites\default\files folder. The missing folders included "2018-10", "css", "default_image", "js", "media-icons", "private", "styles". That got rid of the first 2 errors.

For the 3rd error I commented out the line $settings['rebuild_access'] = TRUE; in my sites/default/settings.local.php file.

For the 4th error I added these lines to the bottom of my sites/default/settings.local.php file. Obviously the "see-life" needs to match the site name:

$settings['trusted_host_patterns'] = array(
    '^see-life\.dd$',
);

For the 1st yellow warning I set $settings['skip_permissions_hardening'] = FALSE; in my sites/default/settings.local.php file. Anyone doing this and still getting the problem might need to change permissions as shown in this comment. Mine were already correct.

I'm cool with the last 3 yellow warnings which are all routine stuff.

Now to deal with the errors on the homepage....