Does google penalise for significant number of 404 errors.
We had our pages automated to 301 when we deleted pages. Today , I checked webmaster and noticed 165 warnings of 404.
If our site has 301 how does google then picks this up?
we now designed 404 unique page that shows users site map search box and links to main site. Is it advisable to have no follow index on 404 pages?
Is it advisable to remove old URLs using webasters tool?
Thank you guys