Hi tatiana,
A breed back is essentially the pairing of an offspring with it's parent or grandparent in order to see what is hidden or try to pull certain traits back out. Another term we use for this is "kittycsest "
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You are right, it's a good idea to get a NC together with some basic introductory terms as breeding is complicated enough to understand as it is, without being confused like this.
Please do ask in group if you don't understand something, we all started somewhere and no-one will take the mickey, and if they do they'll soon get shot down hehe.
Happy breeding