Easy Learn
A plain-language, beginner-to-architect walkthrough of why no software system can be optimized for everything at once — what optimization actually means, the three unavoidable reasons total optimization is impossible (shared limited resources, mathematical opposites, and the weight of every added feature), the four ingredients (time, space, money, simplicity) that almost…
A complete, beginner-friendly walkthrough of one of the most famous jokes in computer science — that there are only two truly hard problems: naming things, and cache invalidation. This guide is entirely about the second one, and treats it seriously rather than as a punchline. Opens with a whiteboard on…
A beginner-friendly, cross-domain deep dive into throughput – the honest measurement of how much genuine work a system produces over a real stretch of time. Opens with the car-wash and cafeteria-line analogies that motivate the whole idea, then traces throughput’s history from twentieth-century factory floors through mid-century telecommunications, into the…
A plain-language walkthrough of why software architects should stay hands-on with code — what “hands-on” actually means (proofs-of-concept, code review, occasional tickets, pair programming, incident response), how ivory-tower architecture quietly develops when architects stop coding, seven concrete reasons hands-on habits pay off (grounded decisions, credibility, sharper trade-offs, crisis usefulness, honest…
A complete, beginner-friendly walkthrough of the Unified Modeling Language — the standardised visual notation that architects use to draw software the same way structural engineers draw buildings. Opens with a multi-country bridge-building analogy: without shared blueprint symbols, one engineer’s triangle means “support beam” and another’s means “danger, avoid.” UML fixes…
A plain-language, beginner-to-architect walkthrough of the CAP theorem: what Consistency, Availability, and Partition tolerance actually mean; why the trade-off is unavoidable during network partitions; how CP systems (HBase, Spanner, ZooKeeper, etcd) differ from AP systems (Cassandra, DynamoDB, Couchbase, Riak); how CAP relates to ACID and BASE; how the extended PACELC…
A complete, beginner-friendly walkthrough of the API contract — the formal, machine-readable agreement that lets a provider and its consumers keep working together reliably even as both sides keep changing. Opens with a drive-through analogy: the fixed window, the menu board, and the agreed order of steps between customer and…
A beginner-friendly, production-grade deep dive into ACID – the four guarantees (Atomicity, Consistency, Isolation, Durability) that keep bank balances, shopping carts, and ticketing systems from silently corrupting. Covers the mobile-banking analogy that motivates the whole idea, then walks through the full history of ACID from Codd’s relational model in 1970,…
A complete guide to the two most confused HTTP status codes: 401 Unauthorized (who are you?) vs 403 Forbidden (what are you allowed to do?). Covers RFC 7235, the two-gate model, WWW-Authenticate, JWT anatomy, OAuth 2.0 flow, Spring Security filter examples, microservices split of coarse authentication at the gateway vs…
A ground-up walkthrough of virtual machines: the history from IBM mainframes and VMware to AWS Nitro and Google Compute Engine; hypervisor internals (VT-x/AMD-V, trap-and-emulate, nested paging, VirtIO, SR-IOV); the VM lifecycle, live migration, snapshots and multi-AZ HA; security and multi-tenancy; monitoring metrics like CPU Ready Time and ballooning; cloud deployment…