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Developer Lessons

Developer Lessons
Story-driven.

From C# to SQL, from architecture to deployment — every concept through real scenarios, from scratch.

23
Lessons
C#
Language
.NET
Platform
01 BASIC
C# Basics — Methods
What is a method, why use it, how to write one — storytelling from scratch.
8 min read
→
02 BASIC
C# Basics — If / Else
What decision structures are and how to think with them, explained through real-life examples.
7 min read
→
03 BASIC
C# Basics — For Loop
Learn the for loop from scratch and automate repetitive tasks.
8 min read
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04 BASIC
C# Basics — While Loop
Understand loops that run while a condition remains true, with simple examples.
7 min read
→
05 BASIC
C# Basics — Switch Case
Learn how to handle multiple cases in a clean and readable way.
7 min read
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06 BASIC
C# Basics — Class and Object
Learn the foundation of object-oriented thinking through classes and objects.
9 min read
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07 BASIC
C# Basics — Array
Learn how to store multiple values in one structure with arrays.
8 min read
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08 BASIC
C# Basics — List
Learn List, one of the most practical ways to store dynamic data.
8 min read
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09 BASIC
C# Basics — String
Understand the basics of working with text through strings.
7 min read
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10 BASIC
C# Basics — Try Catch
Learn how to handle errors and keep the program running safely.
8 min read
→
11 BASIC
C# Basics — Interface
The gateway to abstraction: what an interface is, when to use it, and why it matters.
9 min read
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12 BASIC
C# Basics — Generics
Learn to write type-independent code with generics — List<T>, Dictionary<K,V> and beyond.
9 min read
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13 BASIC
C# Basics — LINQ
The most powerful way to query collections: filter, sort, and transform with LINQ.
10 min read
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14 BASIC
C# Basics — Async / Await
Understand async programming through story — the logic of doing other work while waiting.
10 min read
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15 BASIC
C# Basics — Nullable & Null Safety
What null is, why it crashes, and how to handle it safely — the ?. and ?? operators.
8 min read
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16 ASP.NET CORE
ASP.NET Core — Action Filter
What an Action Filter is, when to use it, and how it fits into the request flow.
9 min read
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17 ASP.NET CORE
ASP.NET Core — Filter vs Middleware
Learn the difference between middleware and action filters, and where each check belongs.
9 min read
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18 DEPLOY
IIS Hosting Model — inprocess vs outofprocess
Why is outofprocess required on shared hosting? Understand the IIS and ASP.NET Core relationship.
8 min read
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19 DEPLOY
ASP.NET Core Configuration Reading Order
appsettings.json, environment files, and environment variables — which wins and why?
8 min read
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20 DEPLOY
Secret Management on Shared Hosting — web.config Approach
What do you do without Azure Key Vault? Manage secrets safely with web.config.
9 min read
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21 DEPLOY
ASP.NET Core Deploy Guide for Shared Hosting
Multi-site setup, real error scenarios, and a pre-deploy checklist to get production-ready.
10 min read
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22 DEPLOY
Cold Start Problem on Shared Hosting and Warmup Cron
Why does your app open slowly on the first request? Learn cold start and its warmup cron solution through a real production scenario.
8 min read
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23 DEPLOY
Neighbor-Site Risk on Shared Hosting and VDS Isolation
What does it mean if .php/.aspx files you never uploaded show up on your server? Learn shared hosting isolation and the VDS difference through a real incident.
9 min read
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