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what books can I consult for properties of pullback and pushouts in algebraic topology?

I need to understand the theory of homotopy in algebraic topology and I started to study pullbacks and push outs, some help please.

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I would start with math.uchicago.edu/~may/CONCISE/ConciseRevised.pdf . I would also look into Model categories. –  Baby Dragon Feb 25 at 6:06
    
thank you very much. –  Knight Feb 25 at 6:22
    
You could look at my book "Topology and Groupoids" pages.bangor.ac.uk/~mas010/topgpds.html, which goes from adjunction spaces to pushouts, and does a lot on groupoids in $1$-dimensional homotopy theory. –  Ronnie Brown Feb 25 at 12:08
    
Any book on homological algebra will do, say Rotman's –  Alexander Grothendieck Feb 26 at 0:04

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