7 Prompt Patterns That Get Better Answers from ChatGPT and Claude
Seven practical prompt patterns — context, examples, format, steps, constraints, delimiters and questions first — with before-and-after prompts you can reuse.
Read article →Category Archives: AI & ML
Artificial intelligence explained by building it: machine learning, neural networks, LLMs, RAG and agents — plus how to build your own language model.
A Neural Network From Scratch in 30 Lines of NumPy
A Neural Network From Scratch in 30 Lines of NumPy
Build and train a two-layer neural network in plain NumPy to solve XOR — forward pass, backpropagation and gradient descent explained line by line.
Read article →Group Customers Automatically with K-Means in Python (From an Excel File)
Group Customers Automatically with K-Means in Python (From an Excel File)
Use k-means clustering to split customers into segments by orders, spend and recency — reading from and writing back to Excel with pandas and…
Read article →Decision Trees in Python: A Model You Can Actually Read
Decision Trees in Python: A Model You Can Actually Read
Train a decision tree classifier with scikit-learn, print its rules as plain if/else text, measure accuracy honestly with a test split, and avoid overfitting…
Read article →Linear Regression From Scratch in Python: How a Model Actually Learns
Linear Regression From Scratch in Python: How a Model Actually Learns
Code linear regression with gradient descent in plain NumPy, watch the model learn slope and intercept, then check it against NumPy and scikit-learn. The…
Read article →Linear Regression in Excel with LINEST, SLOPE and FORECAST — No Add-ins
Linear Regression in Excel with LINEST, SLOPE and FORECAST — No Add-ins
Machine learning starts with a straight line. Fit a regression in Excel with SLOPE, INTERCEPT, RSQ, LINEST and FORECAST.LINEAR, and learn how to read…
Read article →AI vs Machine Learning vs Deep Learning vs LLM: The Difference in 5 Minutes
AI vs Machine Learning vs Deep Learning vs LLM: The Difference in 5 Minutes
AI, machine learning, deep learning and LLMs are nested ideas, not rivals. A short, jargon-free explanation with everyday examples of each.
Read article →Using AI to Write Excel Formulas — and How to Check Its Work
Using AI to Write Excel Formulas — and How to Check Its Work
AI assistants can draft Excel formulas and VBA in seconds, but they also make confident mistakes. How to prompt them well and a 5-step…
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