A simple resource about tensors

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...is what I am looking for, to understand what is written in GR books.

Schutz' First Course In GR is the simplest I could find which has a part dedicated to their explanation but I am looking for something simpler than that. I am looking for something which is not a long mathematics textbook but explains how to understand what is written in tensor notation.
 
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Schaums outline on tensor analysis would be a good place to start. I used mcconnells book when I did an indep study on tensors. It was a Dover publication.
 
much appreciated
 

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