Charset :ASCII was the first character encoding standard (also called character set). ASCII defined 127 different alphanumeric characters that could be used on the internet: numbers (0-9), English letters (A-Z), and some special characters like ! $ + - ( ) @ .ANSI (Windows-1252) was the original Windows character set, with support for 256 different character codes.
Code Type : This shows what type of coding was used in the design of your site.
HTML Version : This shows the version od coding you used in the design of your site.
Robots.txt : This is to let the robots.txt used by the search engines, know how to navigate your site. We advise that you use robots.txt.
Responsive : Shows whether or not your site which is compatible with desktop computers, is also compatible with tablet computers and mobile devices. Use: you can show this with the tag : meta name="viewport" content="width=device-width, initial-scale=1.0" />.