Where can I find a primer on using variables with some examples?

I'm looking for an intro to using variables--the online Help was not much use, and the search I did of the posts here were for fairly specific questions. I've been to the imtermediate training, but its been a while. I'm trying to create a results page for a survey that has 20 Likert questions. I want to assign each point on the Likert scale a value and then tally of the numbers for each question to get a final score. Any suggestions on this specifically or a general intro to variables?


Thanks.


Jo

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