A personal knowledge base — series, notes, and references on security, ML, AI, DevOps, and OSINT.https://noteandsave.com/https://noteandsave.com/blog/classification-intro.mdx/https://noteandsave.com/blog/classification-intro.mdx/A comprehensive introduction to classification in machine learning: logistic regression, decision boundaries, confusion matrices, and a guide to the most common classifiers.Fri, 17 Apr 2026 00:00:00 GMThttps://noteandsave.com/blog/intro-to-machine-learning.mdx/https://noteandsave.com/blog/intro-to-machine-learning.mdx/What machine learning really is, how it differs from traditional programming, and where it shows up in everyday life - from Netflix recommendations to fraud detection.Wed, 15 Apr 2026 00:00:00 GMThttps://noteandsave.com/blog/regression-intro.mdx/https://noteandsave.com/blog/regression-intro.mdx/A deep dive into regression analysis: linear regression from scratch, cost functions, gradient descent intuition, and real-world examples with data tables and visualizations.Fri, 17 Apr 2026 00:00:00 GMThttps://noteandsave.com/blog/same-origin-policy.mdx/https://noteandsave.com/blog/same-origin-policy.mdx/SOP is a security measure built in browsers to prevent script or resource loading from different origins.Mon, 08 Sep 2025 00:00:00 GMThttps://noteandsave.com/blog/supervised-learning.mdx/https://noteandsave.com/blog/supervised-learning.mdx/How supervised learning works, the difference between regression and classification, and a hands-on walkthrough with real tabular data.Thu, 16 Apr 2026 00:00:00 GMThttps://noteandsave.com/blog/unsupervised-learning.mdx/https://noteandsave.com/blog/unsupervised-learning.mdx/What unsupervised learning is, why it matters, and how algorithms like K-Means clustering and PCA discover structure in unlabeled data - with real-world examples and visualizations.Sat, 18 Apr 2026 00:00:00 GMThttps://noteandsave.com/blog/zero-click-attacks.mdx/https://noteandsave.com/blog/zero-click-attacks.mdx/In a Zero-Click attack, the hacker wins the moment their data reaches your device. You don't have to touch your phone, answer a call, or open a message. It happens silently in the background.Tue, 30 Dec 2025 00:00:00 GMThttps://noteandsave.com/blog/osint-social-media.md/https://noteandsave.com/blog/osint-social-media.md/OSINT (Open-Source Intelligence) is the practice of gathering information from publicly available sources. It’s used in cybersecurity, investigations, journalism, and even by everyday people who just want to learn more about someone or something online.Fri, 05 Sep 2025 00:00:00 GMThttps://noteandsave.com/blog/cross-site-scripting-xss.md/https://noteandsave.com/blog/cross-site-scripting-xss.md/Understanding XSS attacks, how they work, and how to protect your web applications from these common security vulnerabilitiesThu, 04 Sep 2025 00:00:00 GMT