The original title is about CPI (Cross-Program Invocation) on Solana, framed as a mental model guide. Let me rewrite this for a mobile feed.

Short summary

Learn cross-program invocation (CPI) on Solana through progressively complex examples: transferring SOL, minting tokens, withdrawing from PDAs, and calling custom Anchor programs. Each concept maps to three CPI components—target program, account constraints, and authorization—with working code examples. Understanding this mental model eliminates confusion around account structs and signer seeds.

• •CPI is a function call with three components: the program being called, the accounts it needs, and who can sign
• •Progressive examples from simple SOL transfers to complex PDA withdrawals and cross-program calls
• •Mental model approach: every CPI code line serves one of the three components

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