Brandon Smith (Redwoodtwig)
Videos of Tai Chi forms are mainly for people who already have a physical grasp of the basics. I very much recommend you find a teacher for the first year or two of Tai Chi learning. Once you've got that under your belt, you will have a much better idea what you are looking at in the Tai Chi videos.
I also highly recommend video selfies: get in front of your camera and do your Tai Chi and then watch the video and see if can see what you are doing. It's very helpful to have a video viewer that will let you slow things down, even though we're trying to do it slowly to start with. For instance, when doing the push, the forward hand movement should stop when the body completes the forward weight shift. This is difficult to sense internally, but easy to see on a video. Learning to sense this kind of thing internally is a key part of gaining the health benefits.
For initial learning of Chi Kung sets, sometimes a video can be an excellent beginning teacher because the focus is generally on single moves without worry about transitions. Having a live teacher in person is certainly better than a dead one, but your mileage may vary.
Below are links to the public Youtube videos I've made, or in a few cases, were made of me by others.