Each bonus page or game page contains detailed terms and conditions for the relevant content on it, meaning that you can double-check the terms at just a glance. This can be important for people who might not be familiar with how many bonuses work.
Be sure to check the site’s FAQ pages or contact their customer service team if you do not understand something. They will be able to clarify anything that does not seem to be immediately clear, which can make a big difference to a new, inexperienced player.