The book is fantastic. Challenges your assumptions and provides you with lots of insights. The only problem is that the availability of the book in India is very low. It takes 4 days to get delivered via FedEx. My pre-order was not dispatched. I had to contact customer care and order the book again. Other than that, a great read.
I will give u a very brief summary of the book. So here it is.
It is important to do a sampling a range of related things in your field before you choose a specialisation. It helps to develop an overall competence so that the skills learnt in other fields act as an added advantage and boost your final skill in your chosen field. Also, you will know which field suits you the best and for which you have a passion which will help you in the long term to achieve excellence on par with the best in the world.
The age of sampling should be typically between 6 to 16. In these formative years you can experiment freely and as your body is flexible and ur brain plastic, you can learn many skills naturally.
Thirdly, not all specialisation needs sampling and range. For eg Golf, Chess and Coding need a lot of practice and pattern recognition rather than different set of skills. So, in such fields u can simply go for a specialisation without wasting time on sampling period.