When certain concepts of TeX are introduced informally, general rules will be stated; afterwards you will find that the rules aren't strictly true. In general, the later chapters contain more reliable information than the earlier ones do. The author feels that this technique of deliberate lying will actually make it easier for you to learn the ideas. Once you understand a simple but false rule, it will not be hard to supplement that rule with its exceptions.
Donald KnuthAlways remember, however, that thereโs usually a simpler and better way to do something than the first way that pops into your head.
Donald KnuthAny inaccuracies in this index may be explained by the fact that it has been prepared with the help of a computer.
Donald KnuthScience is knowledge which we understand so well that we can teach it to a computer; and if we don't fully understand something, it is an art to deal with it.
Donald Knuth