To onboard yourself to a new product or industry, especially in a specialized field like fintech, start by meeting individually with team members to understand their roles and the product deeply. Take detailed notes, synthesize them into a comprehensive document, and maintain a file capturing everything you learn. Regularly ask questions to clarify and fill gaps in your knowledge, and leverage the initial "newbie" period when colleagues are more willing to help. The more you immerse yourself, the faster you'll connect the dots.