Hello friends,
                         Please tell me where can I study SEO......?

Hi Friends,
Websites to Learn SEO Online

• Web-Savvy-Marketing. Web-savvy marketing is a platform that specializes in growing your web presence.
• 
  SEO 101. The absolute basics as written by Jill Kocher.
• 
  Google
• 
  Moz.com.
• 
  Search Engine Watch.
• 
  Webmaster World.
• 
  Search Engine Journal.
• 
  Search Engine Land.

You can learn seo online. There are so many  online platforms to learn seo properly. The platforms are following
a) moz.com
b) udemy.com
c) searchenginejournal.com
d) lynda.com

you may learn seo as offline and online also. you can learn seo offline in your institute and you may learn seo as online on following platforms.
a) moz.com
b) neilpatel.com
c) udemy.com

Online & Offline both.
It depends on your interests.

SEO Online Study
web-savvymarketing
SEO 101
google
Moz

You may learn seo as online the best sites where  you can learn seo very easily. The best  sites are following
a) moz.com
b) neitpatel.com

If you want to learn SEO basic to advance strategies, just want to share some best SEO learning tools where you can learn basic to adevance SEO See bellow : -
searchengineland
searchenginewatch
seomoz blog
search engine journal
Neil Patel Blog