Remember that storing information in variables is like putting data into labeled boxes?

For example: let score = 100;

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Can you tell me what value is stored in score?

Now, let's talk about the names we give our variables. Just like you can't label a real box with anything (maybe not symbols or blank spaces), there are rules for naming variables in JavaScript.

Variable names can contain letters (a-z, A-Z), numbers (0-9), the underscore character (_), or the dollar sign ($).

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Make sense so far?

However, there's a catch with numbers: a variable name cannot start with a number.

So, player1 is a valid name, but 1stPlayer is not.

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Do you think we can make a variable named 0Day?

Another important rule: variable names cannot contain spaces. If you want to represent a multi-word concept, use camelCase like highScore (which is common in JavaScript).

For example, highScore is good, but is not.