Actually, I've felt that finding a resources to learn how to read or listening comprehension is quite easy. But, to train my mind to always remember what I read and what I listen is not really as easy as I would like it to be.

This is due to characters and pronunciations that are not always unique and distinguishable. If my eyes and my ears are tired, it's not really easy to comprehend what I read and listen. No matter how much I tried to absorb my reading and listening, there's always a limit in what I can achieve on one day, and what I remember in one week.

Understood that the solution to this difficulties is always to practice more, but if that is the only solution, then there's no point to improve teaching method.

Then another thing is Chinese websites tend to be slower when accessed outside China.