Some designs have plinth blocks as shown below or the door trim extends straight and flush to the floor.
Trim out hardwood floor by doors.
Trim around doors and windows is normally very simple and flat with eased edges although header caps are frequently used as shown here.
If the door works properly measure the width of the opening and add the width of the casing.
Check to see if your door will close over it by placing a small piece of it on the floor under the door.
This can be accomplished by setting a piece of hardwood on the subfloor next to each component and marking across the component with a pencil.
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Use a saw or multitool to cut the jambs trim and molding at the pencil marks.
Determine the height to cut the stop molding and jambs.
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That way hardwood planks can slip right underneath the casing to give the impression.
A base shoe shown the baseboard just has an eased.