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Now we're going to learn about if statements.
If statements are a fundamental part of learning

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to program. They help a computer make decisions.
All computers use if statements, including

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my phone. For example, when I unlock my phone,
it runs some code that says if I enter the

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password correctly, then unlock the phone.
Otherwise, it shows an error message.

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You can use if statements in your code to make
Steve and Alice react to what they see in

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the world. For example, if there is a rock
in front of them, they can turn left. Or turn

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right if they run into a tree. In this case,
we don't want to fall in the lava.

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It's easy to plan for the lava. We can see it on
the screen. But what about the lava that we

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can't under the stone?
After we mine the stone, we'll need to check

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if there's any lava in that place before moving
forward. If there is lava there, we want to

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place a stone in front of our character before
we move forward. That way we can safely move on.

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Time for more mining! And remember to
use the if statement to watch your step.