Technology & Computer Science: Bitcoin is built on cryptographic principles and blockchain technology. Understanding its consensus mechanisms, wallet security, mining process, and smart contracts requires a solid foundation in computing and programming.
Economics & Finance: Grasping Bitcoin’s monetary policy, scarcity, market dynamics, and its role as an alternative asset involves economic theory, supply and demand, game theory, and financial analysis.
For those who wants to just invest and make money from Bitcoin may not really want to consider all of this except for the economic part, because for them what is most important is the ROI they make from their assets and yes you actually don't need an indepth knowledge of the technology may not be needed for you to be able invest in Bitcoin except how to secure your assets.