If I Were to Start My Data Science Career from Scratch, Here's What I Would Do 👇

1️⃣ Master Advanced SQL

Foundations: Learn database structures, tables, and relationships.

Basic SQL Commands: SELECT, FROM, WHERE, ORDER BY.

Aggregations: Get hands-on with SUM, COUNT, AVG, MIN, MAX, GROUP BY, and HAVING.

JOINs: Understand LEFT, RIGHT, INNER, OUTER, and CARTESIAN joins.

Advanced Concepts: CTEs, window functions, and query optimization.

Metric Development: Build and report metrics effectively.


2️⃣ Study Statistics & A/B Testing

Descriptive Statistics: Know your mean, median, mode, and standard deviation.

Distributions: Familiarize yourself with normal, Bernoulli, binomial, exponential, and uniform distributions.

Probability: Understand basic probability and Bayes' theorem.

Intro to ML: Start with linear regression, decision trees, and K-means clustering.

Experimentation Basics: T-tests, Z-tests, Type 1 & Type 2 errors.

A/B Testing: Design experiments—hypothesis formation, sample size calculation, and sample biases.


3️⃣ Learn Python for Data

Data Manipulation: Use pandas for data cleaning and manipulation.

Data Visualization: Explore matplotlib and seaborn for creating visualizations.

Hypothesis Testing: Dive into scipy for statistical testing.

Basic Modeling: Practice building models with scikit-learn.


4️⃣ Develop Product Sense

Product Management Basics: Manage projects and understand the product life cycle.

Data-Driven Strategy: Leverage data to inform decisions and measure success.

Metrics in Business: Define and evaluate metrics that matter to the business.


5️⃣ Hone Soft Skills

Communication: Clearly explain data findings to technical and non-technical audiences.

Collaboration: Work effectively in teams.

Time Management: Prioritize and manage projects efficiently.

Self-Reflection: Regularly assess and improve your skills.


6️⃣ Bonus: Basic Data Engineering

Data Modeling: Understand dimensional modeling and trade-offs in normalization vs. denormalization.

ETL: Set up extraction jobs, manage dependencies, clean and validate data.

Pipeline Testing: Conduct unit testing and ensure data quality throughout the pipeline.

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Important skills every self-taught developer should master:

💻 HTML, CSS & JavaScript — the foundation of web development

⚙️ Git & GitHub — track changes and collaborate effectively

🧠 Problem-solving — break down and debug complex issues

🗄️ Basic SQL — manage and query data efficiently

🧩 APIs — fetch and use data from external sources

🧱 Frameworks — like React, Flask, or Django to build faster

🧼 Clean Code — write readable, maintainable code

📦 Package Managers — like npm or pip for managing libraries

🚀 Deployment — host your projects for the world to see

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Fullstack Developer in 200 days 👆

Master Javascript :

The JavaScript Tree 👇
|
|── Variables
| ├── var
| ├── let
| └── const
|
|── Data Types
| ├── String
| ├── Number
| ├── Boolean
| ├── Object
| ├── Array
| ├── Null
| └── Undefined
|
|── Operators
| ├── Arithmetic
| ├── Assignment
| ├── Comparison
| ├── Logical
| ├── Unary
| └── Ternary (Conditional)
||── Control Flow
| ├── if statement
| ├── else statement
| ├── else if statement
| ├── switch statement
| ├── for loop
| ├── while loop
| └── do-while loop
|
|── Functions
| ├── Function declaration
| ├── Function expression
| ├── Arrow function
| └── IIFE (Immediately Invoked Function Expression)
|
|── Scope
| ├── Global scope
| ├── Local scope
| ├── Block scope
| └── Lexical scope
||── Arrays
| ├── Array methods
| | ├── push()
| | ├── pop()
| | ├── shift()
| | ├── unshift()
| | ├── splice()
| | ├── slice()
| | └── concat()
| └── Array iteration
| ├── forEach()
| ├── map()
| ├── filter()
| └── reduce()|
|── Objects
| ├── Object properties
| | ├── Dot notation
| | └── Bracket notation
| ├── Object methods
| | ├── Object.keys()
| | ├── Object.values()
| | └── Object.entries()
| └── Object destructuring
||── Promises
| ├── Promise states
| | ├── Pending
| | ├── Fulfilled
| | └── Rejected
| ├── Promise methods
| | ├── then()
| | ├── catch()
| | └── finally()
| └── Promise.all()
|
|── Asynchronous JavaScript
| ├── Callbacks
| ├── Promises
| └── Async/Await
|
|── Error Handling
| ├── try...catch statement
| └── throw statement
|
|── JSON (JavaScript Object Notation)
||── Modules
| ├── import
| └── export
|
|── DOM Manipulation
| ├── Selecting elements
| ├── Modifying elements
| └── Creating elements
|
|── Events
| ├── Event listeners
| ├── Event propagation
| └── Event delegation
|
|── AJAX (Asynchronous JavaScript and XML)
|
|── Fetch API
||── ES6+ Features
| ├── Template literals
| ├── Destructuring assignment
| ├── Spread/rest operator
| ├── Arrow functions
| ├── Classes
| ├── let and const
| ├── Default parameters
| ├── Modules
| └── Promises
|
|── Web APIs
| ├── Local Storage
| ├── Session Storage
| └── Web Storage API
|
|── Libraries and Frameworks
| ├── React
| ├── Angular
| └── Vue.js
||── Debugging
| ├── Console.log()
| ├── Breakpoints
| └── DevTools
|
|── Others
| ├── Closures
| ├── Callbacks
| ├── Prototypes
| ├── this keyword
| ├── Hoisting
| └── Strict mode
|
| END __

📌 Python Cheatsheet: Master the Foundations & Beyond
Start learning Python →

⬇️ Core Python Building Blocks

Basic Commands
→ print() – Display output
→ input() – Get user input
→ len() – Get length of a data structure
→ type() – Get variable type
→ range() – Generate a sequence
→ help() – Get documentation

Data Types
→ int, float, bool, str – Numbers & text
→ list, tuple, dict, set – Data collections

Control Structures
→ if / elif / else – Conditional logic
→ for, while – Loops
→ break, continue, pass – Loop control

⬇️ Advanced Concepts

Functions & Classes
→ def, return, lambda – Define functions
→ class, init, self – Object-oriented programming

Modules
→ import, from ... import – Reuse code

⬇️ Special Tools

Exception Handling
→ try, except, finally, raise – Handle errors

File Handling
→ open(), read(), write(), close() – Manage files

Decorators & Generators
→ @decorator, yield – Extend or pause functions

List Comprehension
→ [x for x in list if condition] – Create lists efficiently


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Backend Development – Essential Concepts 🚀

1️⃣ Backend vs. Frontend

Frontend – Handles UI/UX (HTML, CSS, JavaScript, React, Vue).

Backend – Manages server, database, APIs, and business logic.


2️⃣ Backend Programming Languages

Python – Django, Flask, FastAPI.

JavaScript – Node.js, Express.js.

Java – Spring Boot.

PHP – Laravel.

Ruby – Ruby on Rails.

Go – Gin, Echo.


3️⃣ Databases

SQL Databases – MySQL, PostgreSQL, MS SQL, MariaDB.

NoSQL Databases – MongoDB, Firebase, Cassandra, DynamoDB.

ORM (Object-Relational Mapping) – SQLAlchemy (Python), Sequelize (Node.js).


4️⃣ APIs & Web Services

REST API – Uses HTTP methods (GET, POST, PUT, DELETE).

GraphQL – Flexible API querying.

WebSockets – Real-time communication.

gRPC – High-performance communication.


5️⃣ Authentication & Security

JWT (JSON Web Token) – Secure user authentication.

OAuth 2.0 – Third-party authentication (Google, Facebook).

Hashing & Encryption – Protecting user data (bcrypt, AES).

CORS & CSRF Protection – Prevent security vulnerabilities.


6️⃣ Server & Hosting

Cloud Providers – AWS, Google Cloud, Azure.

Serverless Computing – AWS Lambda, Firebase Functions.

Docker & Kubernetes – Containerization and orchestration.


7️⃣ Caching & Performance Optimization

Redis & Memcached – Fast data caching.

Load Balancing – Distribute traffic efficiently.

CDN (Content Delivery Network) – Faster content delivery.


8️⃣ DevOps & Deployment

CI/CD Pipelines – GitHub Actions, Jenkins, GitLab CI.

Monitoring & Logging – Prometheus, ELK Stack.

Version Control – Git, GitHub, GitLab.

Like it if you need a complete tutorial on all these topics! 👍❤️

Web Development Best Resources

ENJOY LEARNING 👍👍

9 tips to learn Data Structures & Algorithms (DSA) effectively:

Master one language first (like Python, Java, or C++)

Start with basics: arrays, strings, linked lists

Practice consistently on coding platforms

Visualize problems to understand them better

Learn patterns — sliding window, two pointers, recursion

Understand time and space complexity

Solve problems before reading solutions

Revisit and revise tough problems

Build a strong foundation before diving into advanced topics

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The Programmer’s Paradox