After run below command, run this: php artisan vendor:publish
and type the sendgridmailer-config index number, click enter.
After publish process edit config\sendgrid_credentials.php file like:
return [ "token" => "your token by sendgrid", "from_email" => "from email address", "from_name" => "from name for emails", "default_subject" => "Default Email Subject", ];

Usage Of This Package

SendgridSender::getInstance()->to("email address to send")->subject("your email sıbject")->send("your email content or html data")