Great way to earn free Bitcoin at participating sites like booking.com. Also if you share your referral link with others you receive an extra $10 worth of Bitcoin.
To install use the Chrome or the more secure Brave Browser to install the Lolli extension and it detects when you are on one of the participating sites.
Here is the link to get started with Lolli : https://lolli.com/ref/tuwgkMAZ9P
If you need help installing, let me know.
Enjoy!