PRESENTING: How a 16-year-old trading card reseller turned his hobby into a multimillion-dollar side business

In 2017, Andrew Park purchased a basketball trading card of Giannis Antetokounmpo for $40,000. Three years later, it sold at an auction for a record-breaking $1.81 million.

The 16-year-old from California has successfully turned his passion for collecting and reselling cards into a lucrative side business by leveraging his online network, buying during off seasons, and occasionally making risky investments.

He looked back on his journey and shared with Business Insider in an exclusive interview his key strategies for making it as a trading card reseller.

"It still feels like a hobby in a lot of ways," Park said. "I really enjoy the time I spend talking with other collectors and trading/buying new cards."

Subscribe here to read our feature: A 16-year-old who just sold a basketball trading card for a record-breaking $1.81 million shares his best strategies for making bank as a card collector and reseller