Setting up nginx, protection, referral spam?

Question

Nginx

Good evening everyone!!!
Too many different referrs started to appear in the logs
something similar
vk.com/znakomstva2u 15 11.2% 15 6.6%
vk.com/renteilat 15 11.2% 15 6.6%
go.mail.ru/search 12 9% 12 5.2%
burger-imperia.com 11 8.2% 11 4.8%
sexidating.xyz 5 3.7% 5 2.2%
lifecorp.me 5 3.7% 5 2.2%
vk.com/dietgumbuy 5 3.7% 5 2.2%
imgur.com/uucYNRD 5 3.7% 5 2.2%
linda.sexidating. xyz/virtual-sex-game-3d 5 3.7% 5 2.2%
cas0.ru/igrovye-avtomaty-besplatno-bezregistracie.html
how to effectively deal with this spam in nginx? and what is it anyway? I did not find my site on these resources, meanwhile the site has been losing positions very much lately.

Answer 1

nginx.org/en/docs/http/ngx_http_referer_module.html

valid_referers none blocked server_names *.example.com example.com;
if ($invalid_referer) {
  return   403;
}