I'm looking at two options to cement a bench.

1) I dig the 3 foot hole, pour cement...etc

2) I use a cement anchor. How does the cement anchor work? Is it as follows: create a mound of cement that extends into the ground and juts out slightly. On the bench's legs attach a metal border through which anchors get drilled? What type of drill would wokr, if I have the correct understanding?

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Depends on the type of anchor. Some cement anchors are similar to your average screw, except the threads are wider. Other cement anchors are similar to a toggle screw, and can be much larger. What follows is how to fasten a concrete anchor that is similar to a screw.

You will need to drill a pilot hole with a concrete drill bit. The packaging will likely say what size bit you need, but a rule of thumb is for the pilot hole to be narrower than the threads of the screw (in this case, the anchor) so they can grip the surrounding material firmly. A hammer drill will work well for your pilot hole, though I managed with the 18v dewalt drill/driver for 1/4" anchors. Then you drive your anchor using a drill. It helps to drill the pilot a bit deeper than the length of the anchor. This will ensure the anchor will drive cleanly.

Not sure about your "Mound of cement" statement.

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