I am a supporter of skepticism, and soon there will be quite a few posts in this regard dealing with the topic from various points of view....
The main theses of the book are:
1. All statements are neither certain nor plausible. In other words: skepticism is true.
2. Skepticism, as formulated above, does not imply any absurd conclusions (in contrast to the view commonly held by philosophers).
3. People do not choose their beliefs. What we believe is determined by psychological processes.
4. People believe in statements that minimize the extent of the unexpected events of which they are aware. (source)
Click here to read the introduction (PDF)