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$\begingroup$If you search the docs for "take every second element", the first hit is Take, which is the function. If you use the free-form input to "take every second element from list", you get %[[1 ;; -1 ;; 2]], which is easily adapted.$\endgroup$
$\begingroup$The function that march and Patrick are referring to is Span, just type ?Span into your notebook to get the information on how to use it.$\endgroup$
$\begingroup$Guy, we should re-open this question, and make it a canonical version. Then mark this one as a duplicate. This might not be that easy to find for a beginner actually ...$\endgroup$
list={1,2,3,4,5,6}; list[[2;; ;;2]].Extract[list, Range[2,Length@list,2].Partition[list, 2][[All, 2]]. Etc. $\endgroup$Take, which is the function. If you use the free-form input to "take every second element fromlist", you get%[[1 ;; -1 ;; 2]], which is easily adapted. $\endgroup$Span, just type?Spaninto your notebook to get the information on how to use it. $\endgroup$