Puzzilla is an interesting website. After logging into FamilySearch, it will create a diagram of your ancestors, kiind of like in the image below. Hovering over the different blue (male) or red (female) dots allows you to select a particular ancestor. Puzzilla then recreates another similar diagram.
In this diagram, the circled blue dot at the center is my 2nd great grandfather, John McBride. The first inner circle of dots are his children. I added several concentric circles around each generation with the most recent generation on the outside. The 2nd circle from John would be his grandchildren. There is a yellow descendancy line (about 1 o'clock) extending from John to me. This is my direct line of ancestors back to John McBride.
Notice that not all the lines come out to present day time. Those are dead end lines, where those individuals (red or blue) either died, didn't have a spouse, were married but never had children OR there is no further FamilySearch information on them. There are several descendant lines that end before branching out to present day time. These are descendant lines just waiting to be explored.
There is a good online tutorial as to how to use this site on the Puzzilla.org website.
