I try to understand the idea behind the different Spatial Reference Identifiers. I understand that the different SRIDs identify different projection views on the earth and that they are important for ensure comparability. This StackOverflow Post also told me:
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All of these [projections] have trade-offs between accurately measuring distance, area or direction -- you can't preserve all three
So I wonder which are the most important SRIDs and for which requirements should I use which ones. Some SRIDs I frequently stumble across are WGS84, 4326 (Lat/Lng), 900913(Mercator).
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