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Lessons (40)

• Variables, Locals, Outputs, and Validation

  Build a configurable local lab with typed inputs, useful outputs, and clear validation errors. Replace hard-coded values …

• Count, for_each, Functions, and Stable Identities

  … name = file.filename } } This creates local file.service["api"] and local file.service["web"] . Add worker = { port = 9000 …

• HCL, Resource Addresses, and Project Layout

  … The labels identify the resource type and local name. filename and content are arguments defined by the local …

• Reusable Modules and Clear Interfaces

  … Start with a local module so you can practice without cloud credentials: text module-lab/ main.tf modules …

• Your First Terraform Project

  Install Terraform and create, change, inspect, and destroy a local file without using a cloud account. Prepare your …

• Cross-Service Data: How to Join Without a Database JOIN

  … Order Service maintains only customer name in a local projection. 5. The page reads orders and local customer …

• Time, Consistency and Distributed Transactions

  … Use monotonic clocks for local elapsed durations, and versions or logical clocks for the ordering the domain actually …

• Terraform: Start Here

  Understand infrastructure as code, the plan/apply workflow, and the learning path from local experiments to team operations …

• State Management (Redux, Zustand, TanStack Query)

  Where should data live in a frontend app? Learn the four kinds of state, when local state is …

• State, Remote Backends, and Locking

  … Backend configuration cannot reference input variables, locals, or resource attributes. It initializes before ordinary configuration evaluation. Use partial …

• VPC Networking Without the Confusion

  … 10.42.0.0/16 → local local connects VPC addresses. 0.0.0.0/0 is the default …

• Product-Scale Frontend Patterns

  … fast, reversible feedback An optimistic update changes the local view before the server confirms it. It should have …

• React Hooks in Practice

  … the function runs only on the first render const [settings, setSettings] = useState(() = JSON.parse(localStorage.getItem("settings") ?? "{}")); For …

• Edge, Platform & Frontend Delivery

  … is well suited to lightweight tasks such as locale negotiation, an authentication redirect, headers, or an experiment assignment …

• Collaborative Document Editing & Real-Time Sync

  … The client applies the edit optimistically to local state, so typing has zero latency. 2. It sends {clientId …

• Data in Microservices: Sagas & the Outbox Pattern

  … a sequence of local steps, each with a compensating action that undoes it if a later step fails …

• Run Containers on AWS with ECR and ECS

  … docker run --rm -p 8080:80 bookshop-web:1 Open http://localhost:8080 from another terminal or browser …

• Testing, Preconditions, and Policy Checks

  … local provider configured: hcl variable "environment" { type = string default = "dev" } variable "replicas" { type = number default = 1 } resource "local …

• Developer Learning Plan and Document-Assistant Capstone

  Follow a practical study plan with deliverables, build a local retrieval baseline, and grow it into an evaluated …

• Docker & Containers

  … persist data in volumes. - Docker Compose runs multi-container apps locally with one command.

• Scalable Frontend Architecture

  … feature. Separate kinds of state State Owner Example --- --- --- Local UI component dialog open, input text URL router selected …

• Message Delivery: Queues, Kafka, Ordering and DLQs

  … Commit a local effect plus processing marker atomically where possible. 3. Bound retries and quarantine poison events with …

• Cluster Networking, DNS and NetworkPolicies

  … inside the cluster. text <service .<namespace .svc.cluster.local From the same namespace, http://shop-api works. From …

• Practical Lab: S3 File Upload and CloudFront Delivery with NestJS

  … an IAM user with access keys (local development) Fine for your laptop. Not what you should run in …

• Views, Triggers & Stored Procedures

  … Use triggers for local data rules, not cross-service workflows. Q29 and Q30: Stored procedure versus trigger A …

• Pods: Where Your App Actually Runs

  … they can call each other through localhost . - Optional shared files : a volume can be mounted into both containers …

• Concurrency, Resilience & Distributed Workflows

  … The transactional outbox writes the business row and an outbox row in one local transaction; a relay publishes …

• Transactions, Indexes & Concurrency

  … It can enforce local rules or audit changes, but hidden work makes writes harder to understand. Prefer declarative …

• EC2, Storage and Auto Scaling

  … Otherwise a user's next request may land on a new instance missing the first instance's local …

• REST vs GraphQL vs gRPC

  … a function on another as if it were local. Contracts are written in Protocol Buffers ( .proto ), and data …

• Topics, Partitions & Offsets

  … orders --partitions 6 --replication-factor 3 --bootstrap-server localhost:9092 Naming tips: use a consistent scheme such as …

• Serverless Architecture

  … services are provider-specific Local testing and debugging Harder; use emulators (SAM, LocalStack) and good tracing Observability Many …

• ACID, Transactions & Locks

  … Put both changes in one local transaction: either both commit or both roll back. ![A transaction either commits …

• Event-Driven Architecture

  … Event-carried state transfer The data consumers need { type: "CustomerMoved", customerId, newAddress } Consumers keep a local copy and …

• Frontend Security

  … Where to store tokens? Storage XSS can steal it? CSRF risk? Verdict --- --- --- --- localStorage / sessionStorage ❌ Yes : any script can …

• IAM Deep Dive: Policy Evaluation, STS and Cross-Account Access

  … Configure a local role profile and verify the resulting caller identity before testing access. AWS evaluates cross-account …

• Frontend Testing Strategy

  … local dev)"}} M -- R["Fake JSON response"] F -.production.- API[(Real API)] The same handlers can power local …

• Code Profiling

  … request - buildReport - sortRows - localeCompare Narrow stack: request - authenticate - verifyToken Investigate the wide path first, then repeat the profile …

• Domains, Load Balancers and HTTPS

  … a tiny Python web server you can run locally to understand the contract. It uses only Python's …

• Serverless: Lambda and API Gateway

  … Never depend on local memory for durable coordination. Retry behavior depends on the caller API Gateway does not …