Instructions

How Anchor maps clients to on-chain work: instruction handlers, Context and accounts structs, typed args, program accounts, ordering across a transaction, and CPI or return data from handlers.

Function signatures and `Context<T>`.

Passing and validating typed inputs.

`ctx.accounts`, `bumps`, and `remaining_accounts`.

Referencing programs in context.

Multi-instruction flows.

Small, validated, single-purpose handlers.