Delete components of a list

Dear all,

I have a question about deleting components of a list. For example, I have a
list that looks like this:

[[1]]
var1 var2 var3
   1    3    4     
   2    2    1   

[[2]]
var1 var2 var3
   2    5    1     
   2    1    7   

[[3]]
var1 var2 var3
   1    6    7     
   3    8    4   

How to delete, say, the first columns of the list or the second rows? Thank
in advance.

Lisa

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