Short, honest write-ups of the ideas that come up in interviews and on the job. Each one teaches the concept properly, cites the Microsoft documentation, and points back to the class that drills it until it sticks.
Premium SSD bills by size tier, not usage — most fleets pay P30 prices for P10 workloads. Measure real IOPS at P95, map to the tier ladder, and know the resize asymmetry before you buy. When Premium SSD v2 ends the problem.
The VNet is free; everything attached to it bills. The billing map for peering, NAT Gateway, private endpoints, gateways and firewalls, how to trace each meter in Cost Analysis, and the three quiet monthly burners.
People search for "the price of Azure WAF" and come away confused, because there isn't one. The WAF is a feature bolted onto a bigger thing you're already paying for — and that bigger thing, not the WAF, is where your money goes.
Oracle's Always Free tier is the most generous permanent free compute in the market — up to 4 Arm cores and 24 GB RAM, two autonomous databases, and storage, all with no expiry. Here are the full specs, the real catches, and what an Azure learner should use it for.
Oracle Cloud free tier vs AWS free tier: the difference that matters is permanence. Oracle's Always Free gives you an Arm box forever; AWS's headline tier is mostly a 12-month trial that starts billing after a year. Table, catches, and where Azure sits.
Azure vs Oracle Cloud (OCI) in 2026: Azure is the broad, market-leading cloud with the biggest enterprise footprint and job market; OCI is the cheaper-on-paper challenger with a famously generous always-free tier. Which one to build a career on, and which one to keep a free box on.
Which cloud is cheapest for a small always-on project — AWS, Azure, GCP, or Oracle? Oracle's Always Free tier usually wins for keeping something running at $0 forever. But cheapest flips once you need managed services or support. A dated 2026 breakdown with the free-tier catches nobody tells you.
The cheapest cloud VM you can run long-term is an always-free one — Oracle's Always Free Ampere ARM instance costs $0 indefinitely. Here's the full ranking, the catch on each, and how the cheap ones turn into a surprise bill.
Is there an Azure VM free tier? Yes and no. New accounts get a $200 credit for 30 days plus a limited 12-month allowance on two small VM sizes — but no VM runs free forever. Here's exactly what's free, for how long, and the catch that causes bill shock.
The fear that stops beginners isn't difficulty — it's the bill. The exact switches that make Azure a free lab, the always-free services, and the one hidden meter (Log Analytics) that catches people out.
Reuse your Windows Server and SQL licenses to drop the software fee — the Software Assurance catch, the vCore math, and how to toggle it.
GPU compute is the whole bill. Right-size, spot, reserve, scale to zero — and know when serverless model APIs beat renting GPUs at all.
Both cut the same bill. A reservation says "I will run this exact VM size in this exact region for a year"; a savings plan says "I will spend five dollars an hour on compute" — and the price of that easier promise is a shallower discount.
A budget is the thirty-second insurance policy against a runaway cloud bill — it emails you as actual or forecasted spend climbs toward your threshold. The catch everyone misses: it warns, it does not stop the spending.
Most overspend is not clever waste — it is idle VMs, over-sized everything, and pay-as-you-go prices on workloads that run all year. The levers that move the bill, in order of effort to payoff.
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