Databases
Installing XAMPP
Set up XAMPP on Windows, choose components and an installation directory, and understand the UAC warning.
2 min readLesson 01
The engineering notebook
Code, explained.
Notes on programming, the web, and how things work underneath. An English home for my original Korean writing.
Explore the archiveAll articles
47 articles- HTML & CSS
What belongs in the head?
A guide to title, style, link, meta, and script elements, including external stylesheets and script loading.
3 min readLesson 04 - Unity
Collisions and Rigidbody2D
Add gravity and collisions to a 2D scene using a Rigidbody2D, BoxCollider2D, and the original practice sprites.
3 min readLesson 07 - Unity
Let's move an object
Read Unity's horizontal input axis and move the practice sprite with a configurable speed.
2 min readLesson 06 - Unity
The structure of a C# script
Understand using directives, the script class, and the difference between Start and Update.
2 min readLesson 05 - Unity
Connecting a C# script editor
Select VS Code as Unity's external script editor and create a Move script in a Scripts folder.
1 min readLesson 04 - Linux
Installing Kali Linux in VirtualBox
An archived walkthrough of installing VirtualBox and importing a Kali Linux virtual machine.
2 min read - HTML & CSS
DOCTYPE and DTD
Understand document type definitions, older HTML declarations, and the short HTML5 doctype.
2 min readLesson 03 - Unity
Installing Visual Studio Code
The original Windows editor setup for the Unity series, including its C# and Unity extension list.
2 min readLesson 03 - Networking
What is a protocol?
Explore protocol syntax, semantics, and timing, plus addressing, sequencing, encapsulation, and other communication functions.
3 min readLesson 05 - Unity
GameObjects and sprites
Create a 2D object, import a practice sprite, and adjust its position, rotation, and scale.
2 min readLesson 02 - Unity
A tour of the editor
Find your way around Unity's Scene, Game, Hierarchy, Project, and Inspector windows and its main transform tools.
2 min readLesson 01 - Unity
Installing Unity
Install Unity Hub and the editor, then create the 2D project used in this archived beginner series.
2 min readLesson 00 - HTML & CSS
Compound selectors and combinators
Select elements by combined conditions, ancestry, and sibling relationships using CSS selectors.
2 min readLesson 03 - C & C++
Characters and strings
Read a character, introduce character arrays, and explore character-classification and conversion functions.
2 min readLesson 15 - C & C++
Return statements and recursion
Use a stopping condition and a recursive function call to print a message repeatedly without a loop.
2 min readLesson 14 - C & C++
Function parameters
Pass values into a function with typed parameters and understand what happens to those values.
1 min readLesson 13 - JavaScript
Hoisting and the temporal dead zone
See why declarations and expressions behave differently, and how var, let, and const interact with the TDZ.
2 min readLesson 09 - C & C++
Declaring and calling functions
Move repeated work into a function and call it from main instead of copying the same statements.
1 min readLesson 12 - JavaScript
Immediately invoked function expressions
Use an IIFE to run a function immediately after defining it, and avoid a common semicolon pitfall.
2 min readLesson 08 - JavaScript
Arrow functions
Write concise arrow functions, use an implicit return, and omit parentheses for a single simple parameter.
1 min readLesson 07 - C & C++
Initializing arrays and counting values
Initialize an array, read values until a sentinel, and count their final decimal digits.
1 min readLesson 11 - JavaScript
Declaring and calling functions
Compare function declarations and expressions, define parameters, and call a function with arguments.
1 min readLesson 06 - HTML & CSS
Selectors and specificity
Learn CSS declaration syntax, universal, type, class, and ID selectors, and how conflicting rules are resolved.
3 min readLesson 02 - HTML & CSS
What CSS does
Compare a page with and without its stylesheet and see how CSS turns HTML structure into a visual interface.
1 min readLesson 01 - Networking
DNS and domain resolution
See why human-readable domain names need DNS, and follow a lookup through caches and name servers.
2 min readLesson 04 - Networking
Subnet masks and address classes
Split an IPv4 address into network and host portions with a subnet mask, and revisit historical address classes.
2 min readLesson 03 - C & C++
Arrays
Store multiple values in an array, use zero-based indices, and read and print array elements with loops.
1 min readLesson 10 - C & C++
Nested loops and star patterns
Use increasing and decreasing counters, nested loops, and spacing to print triangle and pyramid patterns.
2 min readLesson 09 - JavaScript
Loops, break, and continue
Replace repeated statements with for, while, and do...while loops, then control iteration with break and continue.
2 min readLesson 05 - C & C++
for loops
Understand a for loop's initialization, condition, and update, then compare it with a while loop.
2 min readLesson 08 - C & C++
while, break, and continue
Repeat statements with while loops, exit early with break, and skip to the next iteration with continue.
2 min readLesson 07 - JavaScript
switch statements
Understand case, default, break, and fall-through, and compare switch with if/else.
2 min readLesson 04 - Networking
IP addresses and ports
Understand IPv4 and IPv6 notation, then distinguish a device's network address from a service's port.
1 min readLesson 02 - C & C++
Conditional statements
Control which statements run with if, nested conditions, else if, and else.
2 min readLesson 06 - C & C++
Operators
Arithmetic, assignment, comparison, increment, decrement, and logical operators in C and C++.
2 min readLesson 05 - JavaScript
if and else
Write conditional branches, recognize falsy values, and compare loose and strict equality.
2 min readLesson 03 - HTML & CSS
Tags, block elements, and inline elements
Understand opening and closing tags and the difference between block and inline layout.
2 min readLesson 02 - C & C++
Variables and types
An introduction to int, float, double, char, and the rules for naming variables.
2 min readLesson 04 - JavaScript
Types, operators, and variables
Explore primitive and object values, operator precedence, and the differences between var, let, and const.
3 min readLesson 01 - C & C++
Reading input with scanf
Read integers, floating-point values, and characters into variables using scanf.
1 min readLesson 03 - C & C++
Format specifiers
Use format specifiers to print integers, floating-point numbers, characters, and strings.
1 min readLesson 02 - JavaScript
Why JavaScript?
Camel case, zero-based indexing, and JavaScript's role in frontend and backend web development.
2 min readLesson 00 - Networking
Networks, OSI, and TCP/IP
Introduce networks and protocols, walk through the seven OSI layers, and map them to TCP/IP.
3 min readLesson 01 - C & C++
Setting up an editor and compiler
Set up Visual Studio Code, C/C++ IntelliSense, and a compiler on macOS or Windows.
2 min readLesson 00 - C & C++
Output with printf
Write a first C program, print Hello World, and use newline characters to format terminal output.
2 min readLesson 01 - HTML & CSS
Getting started with HTML and VS Code
Learn what HTML does, install Visual Studio Code, and write headings and paragraphs.
2 min readLesson 01
From the original blog
Two historical notices, preserved separately from the tutorials.
Welcome to Informatics The original about page