[racket] tutorials on using redex

Hi,
I've been working with redex (a little bit) trying to work my way through "Semantics Engineering".  Is there anything resembling an idiots guide to programming languages?  The specialized terms in Semantics are slowing me way down.  It probably is necessary to have that approach.  In that case, I'll just have to do the slog!
 
Best,
 
Dan
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