Everyone comes to Bitcoin for their own reasons and in their own way.
Key points for beginners: Bitcoin is a decentralized digital currency that operates without a central authority. It uses a technology based ledger, called the blockchain, for secure transactions which cannot be altered. You can own fractions of a Bitcoin. There will never be more than 21-million.
Secondary: Understanding mining and wallets.
Not so important to know: Technical details on how the blockchain works or advanced trading strategies.