What's changed: In-scope coverage: added a management/governance/cost in-scope services block to Ch6 (Management Console/Control Tower/Service Catalog/Service Quotas/License Manager/CloudFormation/Systems Manager/Compute Optimizer/Cost and Usage Report)
6.1Pricing Models, Billing, and Cost Management
Understand AWS pricing models (On-Demand, Savings Plans/Reserved, Spot), the Free Tier, and cost-management tools (Pricing Calculator, Cost Explorer, Budgets, Organizations consolidated billing).
AWS is fundamentally pay-as-you-go, but you can get discounts and optimize cost. The two keys are choosing the right pricing model and using cost tools to estimate, visualize, and rein in spend. AWS’s pricing philosophy is "pay less by using more / by reserving."
6.1.1Pricing models and the Free Tier
- On-Demand: pay per use, no long-term commitment—most flexible but priciest per unit.
- Savings Plans / Reserved Instances (RI): a big discount for a 1–3 year commitment—good for steady workloads.
- Spot Instances: use spare capacity at up to ~90% off (can be interrupted)—good for interruptible batch work.
- Free Tier: three forms—12-month free, always-free, and trials.
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