Tips and tricks may not be deliberately hidden, they can be there, but they are just applicable because of the properties of some tools. For example, they are the natural process of tools when they are combined. That means there may be even more tips and tricks to be discovered. Also, it is hard to learn everything all at once, so persons usually learn what is immediately important then by exploring and researching they find new ways to get things done. Some persons may know one method and a new method may seem like it was hidden to them.