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This question already has an answer here:

I am trying to figure out what classification codes and returns that I should use to create DTM and DSM?

In my layer --> "BrooksCamp.lasd" I have these classification codes and returns:

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(and then 26 to 31 reserved)

I am using the LAS Dataset to Raster tool.

marked as duplicate by Andre Silva, Mapperz Nov 30 '16 at 18:30

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Generally, assuming your data classification conforms to the ASPRS LAS Classification guidelines, you'll use class 2 for ground as a bare earth DTM and first returns for a full feature DSM. There are buttons in the LAS Dataset properties window with predefined filters for just such a task.

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