Gyana Yoga
Right analysis of the reflexion of your experience, using this experience to improve the field of intellect,  using this intellect to becomes liberate, during this process, also analysis right knowledge of  the matter and it's existence causes is Gyan Yoga. Or simply, using your experience and itellect to becomes balanced mind and liberate.
...Kashinath
There is one another way to know the truth. After knowing the truth, it becomes easier to find the path and easier to walk on it and easier to get the achievement. We use here, our own mind without any external activities to imporve the latent knowledge. On this behalf of knowledge we get our target. All the yoga have same target even they have different than each other as same as human beings. All the human being have same truth on the basic level of existence but on the experience level they all are different than each other. So basic truth(target) of all yoga is same but way to get this target is different.
If you get this target through your own intellect than is called Yoga through Gyan or Gyan yoga. For the example: to know the truth about body is just the material and it will destroy oneday, from out side how is looking but in real it is the packing of nerves, liquid, bone, chemicals itc. itself working to balance the mind. Then what is thing which is making this body as evrythings. But facing this truth you should develop your charater and think the life of also from different angle(Swadhyay).
If you like to eat pizza but there is only some numbers of boild rice available. Here you can think that, why is not pizza there and becomes anger. Or you try to know the truth of existence of the pizza. You can also think, pizza is only subject about the tongue, down of the throat no anymore pizza. Satisfaction is also running parallel many time during your realization of truth. satisfaction is not the symbol of Gyan(knowledge) but it is one important factor to develop the latent Gyan but if you analysis as a existence cuases of material and its truth.

Continue topic to explaining Gyan Yoga:
1. Gyanenedriya
2. Example to explain matterial and it's truthness
3. Yathartha Gyan
4. Realization of the matter
5. Realizazion of the body
6. Realizazion of the unstability
7. Realization of the stability
8. Realization of the pure form of energy

As soon as possible, I will complete the above topics.
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