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Hello! I have a question about calculations. For example, you add the values ​​of checkboxes and other elements. If none of the checkboxes is initially selected, or then NAN is given in the final amount. How can I make it be 0?

What do you mean by 'cleaning'?
To which part of software is this question related?

there was an automatic substitution of the word, but I didn't notice

fixed

Note that this is not specifiuc to WWB, this is standard browser behavior :
But you can use JavaScript to check for NaN https://developer.mozilla.org/en-US/doc ... ects/isNaN