Core concept
M7i (Intel), M7a (AMD), M7g (Graviton). Each optimized for latency vs price. Suffix: n (network), d (NVMe), z (high freq).
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How it works
Nitro-based (2018+) is the modern platform. Older Xen instances deprecated. Choose current gen for perf + price.
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Trade-offs + gotchas
Wrong family = 3x cost or performance hit. R for RAM-hungry (Cassandra, Redis). C for CPU (batch, ML preproc). M for typical web + microservices.