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Topic hub

General

46 free general lessons — newest first.

General lessons

deepseek-harness — trending on GitHub

Longest Subsequence With Non-Zero Bitwise XOR

Why Did Pharma Sales Drop in March? Python Project Tutorial

2029. Stone Game IX | LeetCode Daily Python Solution (winner decided before move one)

Maximum Subarray Sum With Length Divisible by K

3622. Check Divisibility by Digit Sum and Product

Building My Own AI Developer Platform — Ep 2: AI architecture

Type 100, Get 160.9 — Build a Unit Converter (Beginner, Web App) in Python Tutorial

Building My Own AI Developer Platform — Ep 1: The idea

State of Coding — Week of Aug 09: One Release Just 32x'd What AI Can Read

genoffice — trending on GitHub

I Built 4 Python Projects in ONE Sitting (Birthday Paradox, Blackjack, Bitmap Message, Bouncing DVD Logo)

621 vs 612: Decoding the Clue That Confused Me

Kimi K3's 256,000 Tokens: What It Actually Buys You

List Vs Set Lookup: One Line Kills O(n) Membership Checks

Line 50 Never Runs — Kai vs Tek | FLT Debates

SQL vs NoSQL: Which One Actually Wins? — Kai vs Tek | FLT Debates

Smallest Palindromic Rearrangement I — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (half the string, mirror the rest)

Spot The Bug Before The Timer Hits Zero: 5 Rounds, 30 Seconds Each

Maximum Product of Three Numbers — 🟢 Beginner (1/3) — LeetCode Python Solution (the negative trap)

Maximum Product of Three Numbers — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (the two-negatives trap)

74% of Women Lived. 19% of Men Didn't. The Data Explains Why

Lesson 11: Why Does return None Happen to Everyone?

Lesson: The 10 Python Functions You've Used 1,000 Times

Maximum Product of Two Digits — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (swap one digit, +60)

Maximum Product of Two Digits — 🟢 Beginner (1/3) — LeetCode Daily Python Solution (the trick nobody sees)

Python Lesson 4: Numbers, Operators & Expressions — Arithmetic, Comparison, Logic & Precedence

Sorted GCD Pair Queries — LeetCode Daily Python Solution (5 Billion Pairs, No List)

Python Lesson 3: Strings & String Methods (Indexing, Slicing, F-Strings, split/join/strip)

GCD of Odd and Even Sums: Why the Answer Is Always n

Lesson: Code That Reads Like English Still Breaks You

Python Lesson 2: Variables & Data Types (int, float, str, bool) Explained

Number of Unique XOR Triplets I — LeetCode Daily Python Solution (the trick nobody sees)

Shift 2D Grid — LeetCode Daily Python Solution (the trick nobody sees)

Maximize Active Section with Trade II — LeetCode Daily Python Solution (the 0-1-0 sandwich trick)

Python Basics: Variables, Loops, Lists & Functions Explained Simply

Find Greatest Common Divisor of Array — LeetCode Daily Python Solution (the trick nobody sees)

How a Web Request Actually Works (in One Diagram)

Python Lesson 7: while & for Loops Explained (range, break, continue)

What If 20 Lines of Code Beat Most Traders' Intuition?

Number of Unique XOR Triplets II — LeetCode Daily Python Solution (the trick nobody sees)

Python Lesson 6: Conditionals — if, elif, else, Truthiness & Nested Logic

Python Lesson 1: Install Python & Run Your First Code (REPL + .py Files)

Python Lesson 5: User Input & Output — input(), f-strings & Your First Interactive Program

Why Does list[5] Crash? Python Lists From Zero to Confident

How Python Got Its Name (It's Not the Snake)