With tomatoes, there are two major types, determinate and indeterminate. A determinate variety comes off mostly all at one time. This is useful if you need a bunch at one time to can or preserve in other ways. An indeterminate variety has tomatoes during a long period of time up until the vine dies. They don't really know the seasons, so as long as they are warm enough, they'll live and bear. I've had tomatoes on my vines in December. In a greenhouse, they'll live much longer.

The guy was showing how to propagate tomatoes by sticking cuttings in the ground. I've gotten better results by putting cuttings into bottles of water. The hairs on the stems turn into roots. After there are plenty of roots, I then plant them. Since they are clones of the original, you can duplicate hybrids. Hybrid seeds don't reproduce true, if they reproduce at all.

For a person starting out, hybrid tomatoes are the way to go, as they are a more certain bet to actually grow for beginners. You should always have a stock of hybrid seeds for times when your heirlooms might have a hard time. Since you can't save the seeds from hybrids, you can take cuttings near the end of the season and root them indoors. Then you can plant them in pots during the winter until spring comes and you can move them outside.