Here is a post that explains why very well:

https://x.com/BurnTheFed/status/1882820454127411690

Why Bitcoin first?

Bitcoin was the first working blockchain. It is simple on purpose. It does one thing: it lets people send money to each other without a bank in the middle. Because it is so simple, it is the best place to learn the big ideas:

• What a blockchain is: a shared record that everyone can check, and nobody can secretly change.
• What a wallet and a key are: your coins are controlled by a secret key, not by a company.
• Why supply matters: there will never be more than 21 million bitcoins.
• What decentralization means: thousands of computers around the world agree on the same record.

Once you understand these ideas, everything else in crypto becomes much easier to follow.

Then Cardano makes sense

Cardano starts from the same ideas and asks: what if we could do more? It adds staking, so every holder can help secure the network and earn rewards without locking their coins. It adds smart contracts, so people can build apps on top. And it adds on chain voting, so holders decide how the network grows.

If you know Bitcoin, you can see clearly what Cardano improves, and also what it must protect: the same fairness and openness that made Bitcoin special.

A simple learning path

1. Read how Bitcoin works, at a beginner level. The original Bitcoin paper is only nine pages long.
2. Install a wallet and send a tiny amount to yourself. Learning by doing is the fastest way.
3. Then read What is Cardano staking? and What is a DRep? on this blog.

Take it slowly. Nobody understands everything in one week, and that is fine.