This quote essentially underlines two key principles: the importance of informed decision-making and the freedom of personal choice.

The first part, “I don’t invest in what I don’t understand,” is a fundamental principle in investing and business. It emphasizes the importance of thorough understanding and knowledge before making any investment decisions. It’s a call to avoid jumping into any investment or business venture blindly, simply because it’s trendy or others are doing it. Instead, one should take the time to understand the business model, the market, the potential risks and rewards, and other crucial factors. This way, one can make a well-informed decision and minimize potential losses.

The second part, “And I don’t want to understand Facebook,” is a statement of personal preference and choice. It suggests that understanding something is not just about ability, but also about interest and willingness. In this case, the speaker is choosing not to understand Facebook, perhaps because they don’t see its value, they don’t agree with its business practices, or they simply don’t have an interest in it. This is a reminder that we have the freedom to choose what we want to learn and understand, and what we want to invest our time and resources in.

In today’s fast-paced, technology-driven world, this quote is very relevant. With the rise of cryptocurrencies, NFTs, and other new investment opportunities, it’s easy to get caught up in the hype and make hasty decisions. However, this quote reminds us to take a step back, do our own research, and only invest in what we truly understand and believe in.

In terms of personal development, this quote can be applied to our learning and growth journey. We should focus on learning and understanding things that align with our interests, values, and goals, rather than trying to learn everything or following what others are doing. By doing so, we can invest our time and energy more effectively and achieve more meaningful growth.