There is abundant evidence that people feel emotions, that some emotions are pleasurable, and that what is pleasurable (over the long term) is by definition good.
Humans live in a material world. Their interaction with this world is mediated by a model of it within their minds, constructed of beliefs about it. Truth is the degree that these beliefs actually resemble that portion of the world they purport to represent. In general, the truer the model, the more effectively people interact with the world and the more pleasurable emotions they elicit.
Moreover, certain parts of the world are more generally useful to know than others, because they apply to the largest number of people and/or have the greatest potential emotional impact.
Thus, there is a body of true and useful information that is generally good to know.
The goal of this website is collect, develop, consolidate, organize and present that knowledge, as simply and beautifully as possible.