GIS geographies one comprehensive explanation

Hello,

I am glad to have landed here. Speaking in the context of state or county level.

What is the comprehensive definitive answer to "Why dont my shapefile tracts match other shapefile tracts?" Repeat the question for block group shapefiles. I have retrieved the GIS files from The state or the Tiger/Shapefile page of census.gov.

Who are the authoritative sources to tract and or blockgroup shapefiles? Tiger shapefiles vs Other shapefiles, isnt there one location I can get the GIS files? 

Is there development on the geographies (tracts, block groups) by the census after release?

Thank you so much.

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