how to use title tag?

Question

How to change the default title tag?

Comments

Do you mean <title> Hello World Website </title> ? Go to your admin, the first General tab to change your site title name.  If you would like to customize more with some funky conditions, you need to override the PHP function that output this in your current theme, or in a plugin. The default function is:

    public function head_title()
    {
        $pagetitle = strlen($this->request) ? strip_tags(@$this->content['title']) : '';
        $headtitle = (strlen($pagetitle) ? "$pagetitle - " : '') . $this->content['site_title'];

        $this->output('<title>' . $headtitle . '</title>');
    }

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The above should be an answer rather than a comment.