Hi Rizwan,
Thanks for your message. We don't offer a public demo site but there's plenty of information about Totara here on the Community if you're looking to learn more! As a starting point, you might want to take our Totara for beginners course or watch a demo webinar for example.
If you'd like a personal demo of Totara, fill in our Request a demo form and someone will be in touch.
Many thanks
Rachel