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This article explains what boolean expressions are and how to write them.
A boolean expression is something that evaluates to true or false. You always write them in this format: ${varname} {operator} {value}.
The operator can be <, >, <=. >=, =, or !=. != means "doesn't equal".
If operator is <, >, <=, or >=, then value must be a number.
$money > 500
$money <= 800
In the first example, we are checking whether the money variable is less than 500.
In the second example, we are checking whether the money variable is greater than or equal to 800.
You can also join together several simple conditions with and, or, and not.
In advanced expressions, not has higher precedence than and, which has higher precedence than or, meaning not is evaluated before and, and and is evaluated before or.
For example, you can check whether money is between 300 and 800 with $money > 300 and $money < 800.
Note that 300 < $money and $money < 800 will always evaluate to false because the variable should come before the value.
Booleans are used in if blocks, for loops, while loops, and do-while loops.