Question: 3D Plot

Question:3D Plot

I have a Matrix O[n,m]:=Value with n:=1..10 and m:=1..10 How can I present the values in a 3D plot with x->n Y->m and Z->Value. One time I want to make a histogramm out of it and in a second case just connect them to a surface How can I do that Thank you very much in advance!
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