How to redirect the www version of the site correctly?

Question

Search Engine Optimization

How and where to redirect from www.example.comto example.com?
There are 3 options in the domain registrar panel: Masked, Unmasked and 301.
Or do it in the nginx settings?
How to do it right for SEO? For articles moved, 301 is understandable, but what to do with such a redirect?

Answer 1

The same as for articles moved.
There is no fundamental difference. It is possible even in php, even in .htaccess, even in the domain panel, but do not forget to check all other options that exclude duplicates:
- http & https
- /index.php & /
- /index.php?par=value & /?par =value
- url ending with / and without / (google says that it likes when there is no / if this is the final page at the end of the url ... or in all cases ... I don’t remember already)
- and a million more possible duplicates , of which I don’t remember one part now, and I don’t know the other.