Machine Learning Basics 5 Things I Wish I Knew First

Last Updated on October 6, 2026 by Editorial Team Author(s): Programming India Originally published on Towards AI. Five simple ideas that make ML tutorials, code and errors finally make sense The first time my model scored 98% accuracy, I took a screenshot. I felt like a genius for about ten minutes. After the opening anecdote, the article lays out five beginner-friendly “machine learning basics” that explain why tutorials can fail in practice: start with data quality rather than algorithms, understand that models only learn from the features you provide, always split training and test data to avoid misleading scores (including guarding against data leakage), interpret performance using the intuition of overfitting vs. underfitting, and remember that ML models predict patterns without true understanding—so wrong outputs typically trace back to bias, missing features, evaluation mistakes, or model capacity. It wraps up with a practical project checklist, an FAQ, and a short conclusion encouraging readers to learn by experimenting on small datasets and intentionally breaking/fixing assumptions. Read the full blog for free on Medium. Join thousands of data leaders on the AI newslette…

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