Craps is, in its essence, a game about guessing what the next roll of the dice will be. Knowing what number each of the bets wins and loses on is critical if one is to have any success at the craps table. And not just that, but how long the bet will remain on the table and what it's payout is. To further add to the complexity, the game is played a myriad of ways around the world, with Las Vegas rules being different than Monaco or Atlantic City. Within this cornacopia of bet options comes an equal amount of strategies.

Craps is played in rounds, revolving around the 'point' being 'on' or 'off'. At the beginning of a round, the point is 'off'. The rolling player rolls the dice until they roll a 4, 5, 6, 8, 9 or 10. This results in the 'point' being set and turned 'on'.

Below you can see the point is set to 6.

Now the rolling player will role until the 'point' is rolled again, or a 7 is rolled.
Either will end the round and turn the point 'off'.
A new round begins and the next player gets to roll.

To place a bet, click on the bet you want to place to bring up the Bet Menu.

The numbers in parenthesis are the payout. In the case above, the 'Pass Line' bet pays one to one.
Use the + and - buttons to adjust your bet amount.
Your current bet amount is denoted by 'Your Bet'. The new bet amount is denoted below in green as 'New Bet'.
Press the 'Place Bet' button to save your new bet. Once your new bet is set, the bet on the table will turn green and display your current bet amount.

To roll the dice, you can either click on them, or press the Space bar. You will know you rolled the dice because they will illuminate and play a sound. Fun!

When you're new to the game, it is typically recommended to play the Pass Line until you get a feel for the rhythm of the game. Next, you might venture into playing the Come, which will expose you to winning on numbers that aren't the point.
Considering you're not playing with real money, experiment with different bets or consult the full rules.

Mathematically speaking, there is no bet where you even technically have a 50/50 chance of winning or losing against the casino. Every single bet has a casino edge built in. In the long term, the house always wins. That doesn't mean you shouldn't play because you'll always lose, But more knowing when to walk away when the dice aren't going your way.
Here, though, if you lose it all, you can just reset your bank! In real life? Not so much.

If you or anyone you know is experiencing issues with gambling, The National Problem Gambling Helpline is available 24/7 at 1-800-522-4700