Truth - a verifiable or indisputable fact, proposition, or principle. That perspective is commonly learned in grade school and high school. There, science is commonly taught as a series of facts or statements that are viewed to be correct or 'true'. Also, there is a tendency to teach that there is a straight-forward scientific method by which scientists add to the database of science. That is not the reality of science.
Common people have a number of problems understanding science.
The thesis of Wolpert's book is that science is 'unnatural'. That is that science is not constructed by using 'common sense', and that doing science requires a conscious awareness of the pitfalls of 'common sense' thinking. One must realize, however, that no two people have exactly the same common sense. Only part of this is true science. One can ride a bicycle without being able to explain the non-trivial physics of its behavior.