User-agent: *
Allow: /
Disallow: /archives/*
Disallow: /category/*
Disallow: /author/*
Disallow: /2018/*
Disallow: /cgi-bin
Disallow: /wp-admin
Disallow: */trackback/
Disallow: */feed/
Disallow: /*/feed/rss/$
Disallow: /category/*

#avoid knowing username:
RewriteEngine On
RewriteCond %{REQUEST_URI} !^/wp-admin [NC]
RewriteCond %{QUERY_STRING} author=\d
^ /? [L,R=301]