There is a lot of folk out there trying to sell online courses for certain martial arts. On YouTube you can even find videos where you are supposed to learn forms. Beside that, there are also tons of books and ebooks which even round up a whole style system. The question many people asked themselves and me is: How effective can it be to learn martial arts through videos or a book? I am not the first one to answer that, but I hope I can give it another point of view with a specific kung fu focus.
Well the answer is pretty simple: You can´t! And you shouldn´t. But let´s break the answer a bit down and more accessible. First let´s take a look at the videos. To do so we have to divide the ocean of videos and online-courses you can find. One is teachers showing how to exercise certain movements or stretching. That is different to intend teaching martial arts online. Of course it is possible to do a fitness online course or even maybe a yoga- exercise. Everything where you can´t make much wrong doing it on your own is good. Getting some new stretchings through videos is a good idea, if you don´t know them.
But if you are not experienced in a style or system or worst not exercising at all, it can actually be dangerous to do so. My Sifu always told us that a martial art can´t be learned without a classical student-teacher-connection. The other question is also why would you?
In traditional martial arts the relationship between a master and his student is more profound than just demanding to do this or that movement. A Sifu, Sensei or however you want to call it, is someone you can call for whatever reason. My Sifu helped me in situation I didn't expect from him. Every once in awhile he would sit down with you and talk about your life and spick the conversations with helpful advices. An online video can´t give that to you.
Some people just want to defend themselves and don't care about their spiritual development. This is totally valid. So let's say you learn a fancy move from a video like a lock or throw. How do you know that you do it right? And how often would you need to repeat it to make your body knowing what to do in a dangerous situation?
A teacher, at least a good one, would make you repeating important movements again and again, until your body will do this as a reflex. That moment is when you really can defend yourself with martial arts. You won´t be able to do so, if you did the technique just a few times or imitated it from a video. Same for kicks, punches and blocks. Of course you could learn general things about this sort of techniques but application is one of the most important parts you need to learn for a proper understanding. I have no idea how often I trained a simple front kick. You are never done to improve. At the beginning you need someone to correct your stance, the power you use, the flow, the intention, the technique, your guard, and so much more. You get my point. Worst case scenario here is to think you learned something in that videos and trying it outside. Don´t!
Learning forms or katas online is a growing market, especially when it comes to Kung Fu and Tai Chi. A lot of movements in forms are very subtile and have a specific meaning and application. Every form will require a specific preparation a master would provide you in a class. Of course it's possible to learn a choreography through videos but not a Kung Fu form. The difference will be visible, because here again you need someone to show you the correct movements, rhythm, stances, and so on.
All that said, we have to have to things or situations in mind: first people who are living remote and want to learn a certain style. And second, martial artists with experience. If you live in a small village with no martial arts school around or not the style you want to learn. Well then you might have to try it online. But at least pay a teacher regularly to skype or talk with him and get corrections. Try to meet at least once every month or so.
People who have experience in martial arts might be more able to learn movements from a video but I still doubt, and I know a lot of them doubt it too, that the learning effect is very big. Maybe some techniques can be learned, but a whole style is not possible. Won´t be! Never, without contact to a master of that particular style.
Finally, that doesn't mean you shouldn't watch this videos. Most of them are fun and you can learn a lot about the theoretical part of martial arts. You can observe which styles does an emphasis on what kind of stances, techniques and so on. As a martial artist it is good to open your mind to other styles and enjoy watching people who know what they are doing. Personally, I admire all the people who are trying to promote traditional martial arts in this times. So support them!