You're learning data science. You're not becoming one.

I once spent three weeks learning gradient descent.

Jun 2 • Josep Ferrer

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May 2026

You write SELECT first. SQL runs it fifth.

The hidden order your database uses to run every query, and why it explains your most confusing errors.

May 31 • Josep Ferrer

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2

You don't have a consistency problem

When I moved to Rotterdam last year, I started three new things in four months.

May 26 • Josep Ferrer

11

1

The Art and Science of Data Visualization

Transforming raw data into compelling visual stories.

May 24 • Josep Ferrer

14

2

6

I went quiet for several months (the diagrams didn't)

I stopped posting in June 2025.

May 19 • Josep Ferrer

14

12

2

Europe's tourist nights hit a record in 2024. The map tells the real story.

The COVID crash, the unequal recovery, and the 20 regions that absorb one in five European tourist nights.

May 13 • Josep Ferrer

3

Europe's renewable energy divide is getting wider, not narrower.

Twenty years of EU climate policy. One inconvenient pattern in the data.

May 13 • Josep Ferrer

3

October 2025

How to Actually Get Started with HuggingFace 🤗

A clear (and human) guide to get started without drowning

Oct 28, 2025 • Josep Ferrer

16

3

How to Actually Get Started with SQL

A clear (and human) guide to get started without drowning

Oct 22, 2025 • Josep Ferrer

13

2

3

How to Actually Get Started with Python

CS15 - A clear (and human) guide to get started without drowning

Oct 14, 2025 • Josep Ferrer

15

3

September 2025

You’re Using ChatGPT Wrong (According to 700M Users)

Notes #13 - Why asking > doing, and how to turn prompts into business decisions.

Sep 16, 2025 • Josep Ferrer

11

3

How to Become a Data Scientist

A clear (and human) guide to get started without getting lost

Sep 15, 2025 • Josep Ferrer

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