An 11-year-old boy has written and published a book on bitcoin in the hopes that it will help younger kids understand the industry.

Andrew Courey lives with his parents and younger sister in Wellesley, Massachusetts. Aside from doing the normal things an 11-year-old should be doing: playing sports or playing on his iPhone, he’s also into bitcoin.

So much so, that he self-published Early Bird Gets The Bitcoin: The Ultimate Guide To Everything About Bitcoin for Amazon Kindle in January, reports CNBC. The 57-page book focuses on the history of the digital currency, ethereum, initial coins offerings (ICOs), and bitcoin wallets.

Courey initially began looking and researching into bitcoin after searching for investment opportunities as part of his plan to earn $20 million by the time he’s 14. According to an agreement with his parents, this would enable him to drop out of school.

Once the 11-year-old had discovered the cryptocurrency he started researching into it further by reading articles and watching YouTube videos. However, Courey wasn’t sold on the idea of bitcoin as an investment choice particularly due to its high volatility.

Given that Courey’s dad, Jeff Courey, knew he was searching for sources of ‘passive income,’ he convinced Courey to write and sell a book with all the information he had learnt, but in a simplified manner.

Courey said:

Anyone can learn about cryptocurrencies if they’re willing to spend 70 to 80 hours researching every source until they find a couple sources that make sense. The whole book, in the simplest terms, is very easy to read and simple to understand.

According to the report, it took Courey three months to research, write, and with his parents help, edit his book. His dad added:

Over the holiday period, he locked himself in his room and just cranked.

Erik Finman may be one individual who could give Courey a few pointers on how to hit his ambitious target of $20 million. The 19-year-old first got involved with digital currencies at the age of 12 when he invested a $1,000 gift from his grandmother into cryptocurrencies.

Notably, he also made a bet with his Stanford-educated parents that if he became a millionaire by the time he was 18 he wouldn’t have to go to college. Such is the success that he has found that Finman was able to set up his first startup, Botangle, an online education platform providing students with connections to teachers digitally. He has since sold that business. He has also been working with NASA and manages his family’s crypto assets.

In a recent report, Finman provided some advice to young people interested in investing. According to him, they should find something they are good at and ‘make money doing it.’