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SkillScope: Choose Your Skill

📘 Notes of Technology

1. HTML

Structures web content with tags like <div>, <a>, <img>.
Semantic elements improve accessibility and SEO.
Uses attributes like href, src, and alt.
Supports multimedia through video and audio tags.
HTML5 introduced local storage and geolocation.

2. CSS

Styles layout, colors, fonts, and positioning.
Uses selectors to target HTML elements.
Supports animations and transitions.
Media queries enable responsive design.
Can be inline, internal, or external stylesheets.

3. JAVASCRIPT

Adds interactivity: popups, form validation, animations, and APIs.
Supports DOM manipulation via document.querySelector, .addEventListener.
Variables: declared using let, const, var.
Functions, loops, and conditional logic form core building blocks.
Can be embedded within HTML or loaded as external scripts.

4. JAVA

Statically typed, object-oriented language used in enterprise and Android apps.
Code is compiled to bytecode and executed on the JVM (Java Virtual Machine).
Uses classes and methods—entry point via public static void main().
Supports inheritance, encapsulation, and interfaces for modular design.
Popular frameworks include Spring, Hibernate, and JavaFX.

5. PYTHON

Interpreted language known for readability and simplicity.
Used in data science, web development, automation, and AI.
Common libraries: NumPy, Pandas, Flask, Django, Matplotlib.
Supports object-oriented, functional, and procedural programming.
Uses indentation to define code blocks—no curly braces needed.

6. SQL

Used to manage and query relational databases.
Core commands: SELECT, INSERT, UPDATE, DELETE.
Tables consist of rows and columns—primary key identifies rows uniquely.
JOIN operations combine data from multiple tables.
Queries can be filtered using WHERE, sorted with ORDER BY.

7. MongoDB

Used to manage and query NoSQL databases.
Data is stored in flexible, JSON-like documents.
Core operations include CRUD (Create, Read, Update, Delete).
Supports indexing for efficient query performance.
Aggregation framework enables complex data processing.

8. Next.js

Framework for building server-rendered React applications.
Supports static site generation (SSG) and server-side rendering (SSR).
File-based routing system simplifies page creation.
API routes enable backend functionality within the app.
Optimized for performance with automatic code splitting.

9. Node.js

Built on Chrome’s V8 engine; non-blocking I/O makes it scalable.
Modules like fs, http, and path handle server logic.
Common tools: Express.js, Socket.IO, Mongoose for databases.
Package management via npm (Node Package Manager).

10. Express.js

Handles HTTP requests with app.get(), app.post(), etc.
Middleware functions allow request preprocessing and error handling.
Ideal for building RESTful APIs and web servers.
Lightweight and flexible, often paired with MongoDB.