Comparisons.

Seventh class. Budgets make decisions: “is expense less than income?” Comparisons return true or false.

Strict equality: === and !== (value and type). 5 === "5" is false. Combine logic with && (and) and || (or).

Mini example:

console.log(10 === 10);
console.log(true && false);

Common mistake: a single = (assignment) instead of === (comparison). Another: using & instead of &&.