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I purchased a gas dryer that accepts a 3/8" NPT gas fitting at the back (typical of most gas dryers, I assume). My main gas line in the wall is 3/4". Total distance from meter to gas dryer is about 15-20 feet.

Given the ideal gas line configuration, what is the ideal fitting to reduce from 3/4" to 3/8"? Or should this be accomplished with more than one fitting (i.e., one fitting from 3/4" to 1/2" and another fitting from 1/2" to 3/8")?

Here is an insert from the Owner's Manual for the LG DLGX9001V:

enter image description here

If the dryer takes a 3/8" NPT fitting for the gas supply, and the home has a 3/4" gas supply pipe in the wall, with what fitting should I accomplish the reduction in diameter?

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I would run 3/4 black pipe close to the dryer location (within 4 feet). Then assemble a Tee with fittings to make a sediment trap, a 3/4 to 1/2 inch reducer, enter image description here

a cutoff valve, and then this appliance connector.

enter image description here

A step up in appliance connectors is this one enter image description here which automatically cuts the flow (to a tiny trickle) if there is grossly excess gas flow as when the hose is disconnected or the appliance fails in some dramatic way.

Some might omit the sediment trap.

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For gas pipe you need to use black iron, or black steel not galvanized pipe. Here is 1 link to 3/4"x 3/8" black iron pipe. Small gas lamps can go as small as 1/4" these are rare here in the U.S. but I have installed them in the past.

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    I would put a shutoff valve at the reducing nipple. This is required in my area when flex pipe is used like @wallyk shows this would be the correct way to plumb the gas to the dryer. – Ed Beal Aug 23 '16 at 19:23

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