Single-linked list use dummy node to avoid special situation advantages more than harm?

The dummy node is the root of the linked list.  In general, the insertion of a single-linked list takes into account the processing of an empty list, but if there are dummy nodes, this is not necessary.

Is that good?

If so, you need to make sure that the single-linked list has dummy nodes before entering the insertion function, so you need to create it, and you need to skip the dummy node each time you manipulate the single-linked list.     In other words, the addition of dummy nodes does not reduce the processing of special cases, instead, these processes are dispersed into other functions. I think that in order to improve the independence of the module, the empty list should be processed to fill up.

Single-linked list use dummy node to avoid special situation advantages more than harm?