Solana for Web Devs

You already write JavaScript or TypeScript. That is the whole prerequisite — no blockchain, no cryptography, no Rust, nothing installed. This course runs entirely in your browser against a real, frozen program on Solana's devnet. You start by reading its live vault account in an explorer, then decode its 49 raw bytes by hand — discriminator, owner, balance, bump — then reproduce its address from seeds, so an on-chain account stops being a mystery and becomes a byte layout you own. Then you sign: transaction anatomy with the exact fee arithmetic, a funded devnet wallet of your own, and a real deposit into the vault, confirmed on-chain with the signature to prove it. You finish by assembling everything into a working account inspector — paste any devnet address, get type, SOL, owner, rent-exemption, and decoded vault fields with every failure path handled. Everything is taught against `@solana/kit` 7.0.0, the current stack; one lesson maps it against the legacy web3.js v1 code you will still meet in the wild, with dates and download counts, so you can read old codebases without writing like them. Version stamp — kit 7.0.0, devnet, authored 2026-07-28.