Solana Week 1, a beginner's perspective

I just started with 100 days of Solana with MLH. The first week was about keypair identification. I have been a developer in the web2 domain for >5 years and finally thought of trying out web3. If you’ve spent years building in Web2, “identity” probably means a combination of usernames, emails, passwords, and maybe OAuth providers. Users sign up, you store their credentials in a database, and your backend decides what they’re allowed to do. On Solana, that entire model flips. There are no userna