There is a plenty of casinos which offer free casino games. You often have to create casino account to play these games as when playing for money. When playing for free you are able to start playing for money, often by clicking the appropriate button.
Free gambling option is available in the free versions of all popular internet casinos
This is the common practice for all people, who are not familiar with some casino to create free account first. This lets you to try gaming in this casino, learn rule's specific.