Robots.txt and cnc what to do?

Question

Search Engine Optimization

Hello. I could not find detailed information on the Internet on the correct use of this file.
Let's say I have a site built according to the mvc architecture, initially the links are of the type site.com/index.php?r=controller/action, mod-rewrit'om we do the cnc and get site.com/controller/action or something like that . How then to write allow for site.com/a/b / site.com/index.php?r=a/b ? Should I write Allow: /a/b ?

Answer 1

Yes, you should write Allow: /a/b forget about site.com/index.php?r=a/b, no one except the server sees it.
Deny directory will be Disallow: /b/*

Answer 2

If you have traffic from the search, then it will be correct to set up a 301 redirect. Because pages with a dynamic count are already in the index