My Website got HACKED! The name of my homepage title and post got changed

This is most likely a redirection hack. Check the contents of your .htaccess and index.php files, they may be sending google visitors elsewhere.

See also https://codex.www.ads-software.com/FAQ_My_site_was_hacked

Also sign up for Google Webmaster Tools, register your site, then you can use the labs – View as googlebot tool to see what Google sees.

I used google webmaster tool, and found out alot of Duplicate title tags!!! Best online roulette ? Best Online Casino!

How can I delete them all?

Did you try accessing one of your pages as the google bot? Did you check for hacks in your .htaccess and index.php files?

“Did you try accessing one of your pages as the google bot?”

How???

“Did you check for hacks in your .htaccess and index.php files? “

Yes,I did. they are fine.

How did hacker insert so many title tags into my posts and homepage? I need a solution

My sitution is something like this (instead of the links, they inject the title tags)

https://linux.byexamples.com/archives/397/wordpress-exploit-we-been-hit-by-hidden-spam-link-injection/

https://deanhunt.com/has-your-wordpress-blog-been-hacked/

To check as googlebot, go into webmaster tools, then click on your domain, then click on “labs” then “fetch as googlebot” and put in a page name into the address box and press “fetch”. It will appear in the page after you refresh.

I’m having the same problem, my titles change to verizon Q Motorola but the links are good. Are there and plugins to prevent these hacks?

See Hardening_WordPress