Writing

Reading and Writing Text Files

Learn how Batch scripts write to files with redirection and read them back using FOR /F, SET /P, and FINDSTR.

.NET and Docker

Learn how to containerize .NET applications with multi-stage Dockerfiles, choose the right base images, and use the SDK's built-in container publishing.

Unit Testing in .NET

How to write fast, isolated unit tests for .NET applications using xUnit and Moq, and the practices that keep a test suite trustworthy.

Web Forms Best Practices

Practical guidelines for writing maintainable, secure, and performant ASP.NET Web Forms applications, from ViewState discipline to layered code organization.

EF Core Best Practices

A practical checklist of habits that keep EF Core applications fast, predictable, and maintainable as they scale.

Your First Query

Writing and executing your first LINQ query against EF Core, including deferred execution, projections, async queries, and the N+1 pitfall.

Writing Custom Matchers

Learn how to extend Jest's expect with expect.extend() to write custom matchers that produce clearer, more expressive assertions and failure messages.

Writing Your First Test

A hands-on walkthrough of writing, running, and understanding your first Jest test file.

Test Scripts Basics with pm.test()

How to write assertions in Postman's Tests tab using pm.test() and pm.expect() to automatically validate API responses.

Component Testing with Playwright

How Playwright's component testing mode mounts individual React, Vue, or Svelte components in a real browser for fast, isolated tests.

Selenium Best Practices

Practical habits — stable locators, explicit waits, Page Object Model, and isolated test data — that turn a flaky Selenium suite into a dependable one.

Cypress Best Practices

A practical guide to writing Cypress tests that are fast, resilient to UI changes, and free of the flakiness that erodes trust in a test suite.

Reading and Writing Data Sources

Learn how Spark's DataFrameReader and DataFrameWriter APIs handle formats like Parquet, CSV, and JDBC, plus schema handling and partitioned writes.

Spark Best Practices

Practical guidelines for writing efficient, reliable, and maintainable Apache Spark jobs in production.

Writing a MapReduce Job in Java

A practical walkthrough of assembling a Driver, Mapper, and Reducer into a runnable Java MapReduce job, from configuration to cluster execution.

Your First Hadoop Job

A hands-on walkthrough of writing, packaging, and running a classic word count MapReduce job on Hadoop, from source to output.

Airflow Best Practices

Practical guidelines for writing reliable, maintainable Airflow DAGs, covering idempotency, DAG design, dependency management, and testing.

Your First dbt Model

How to write, materialize, and run a basic dbt model, including the ref() function and how dbt builds its dependency DAG.

PowerShell Best Practices

Practical conventions for writing PowerShell scripts and functions that stay readable, safe, and maintainable as they grow.

MAUI Best Practices

Practical guidelines for structuring, optimizing, and shipping production-quality .NET MAUI applications.

T-SQL Best Practices

Practical, production-tested guidelines for writing T-SQL that is correct, performant, and maintainable in SQL Server.

Fortran Best Practices

Practical guidelines for writing clean, portable, and performant modern Fortran code, from type safety to array handling.

Pascal Best Practices

Practical conventions for writing clean, maintainable, and bug-resistant Pascal code, from naming and scoping to structured control flow.

Your First Apex Class

A hands-on walkthrough of writing a simple Apex class, covering class structure, methods, access modifiers, static vs instance members, and how to test it.