Neural Networks Starter Kit: 9 Fundamental Building Blocks for Developers

Learn the essential neural network fundamentals if you’re a developer new to AI and machine learning.

Try These Proven Techniques for Improving Your Webpage Speed

Learn how we boosted FreeDevTools' PageSpeed Insights score to a near-perfect 95. From optimizing TTFB to implementing critical CSS, we'll cover the key strategies that transformed our site's performance.

How to Build a In-Memory Cache in Go Using Generics With TTL

There is a famous saying in computer science: "There are only two hard things in Computer Science: cache invalidation and naming things." — Phil Karlton It is challenging to balance performance (caching aggressively) with accuracy (ensuring users see the latest data immediately). If you cache too much, users see

How SQLite Turns Hardware Chaos into Correctness

Databases live in a pretty messy world: crashes happen, writes tear, and nothing is guaranteed. SQLite deals with all of that quietly in the background, and this post takes a look at how.

Deeper Data-Science with DoWhy: Causal Modeling in Python

Learn how causal inference with DoWhy goes beyond prediction to answer 'what if we intervene?' questions. This tutorial uses a student attendance example to demonstrate the difference between correlation and causation in data science.

Introducing Installerpedia - Install Anything With Zero Hassle

Software installation is still fragmented, manual, and error-prone. Installerpedia proposes a structured, community-driven way to make installing any tool reliable and effortless.

How Netflix Uses Matrix Factorization to Predict Your Next Favorite Movie

Discover how Matrix Factorization solves the empty star problem that once challenged Netflix. This article explores using Stochastic Gradient Descent to bridge the gap between missing data and perfect matches.

From Commits to DAGs: How Git Uses a DAG to Track Your Code History

Most developers use Git daily, often memorizing commands without fully understanding what happens under the hood. We know how to use git add and git commit, but do we really know how it works? At its core, Git is a simple key-value data store. It is a database, and understanding

Diagnose & Fix Painfully Slow Ollama: 4 Essential Debugging Techniques + Fixes

Frustrated with laggy Ollama? Try out these debugging techniques

Designing a Go ETL Pipeline When SQLite Allows Only One Writer at a Time

At scale, ETL is no longer just extract → transform → load. It becomes a systems problem. You’re ingesting thousands of assets, transforming them aggressively, and trying to persist results fast enough that storage doesn’t collapse under contention. When SQLite is your storage layer, this tension becomes impossible to ignore,

Building a Bayesian Spam Classifier from First Principles

We work through the original Bayesian Spam Classifier paper from Microsoft Research. And then make it practical by applying to the Enron spam dataset

CAVLite: Lightweight, Memory-Efficient Security Audit for Low-RAM Servers.

If you run a server with limited resources—specifically, standard 4GB RAM and 2 vCPU setup- you are likely familiar with the constant, stressful balancing act between performance and security. You know you need antivirus protection and system audits. You know the risks of leaving a server vulnerable to intruders,

ufw

Announcing udwall: A New Tool for Making UFW and Docker Play Nice With Each Other

Many of us believe that the combination of UFW and Docker is the standard stack for deploying applications securely without exposing docker container ports. Configuring UFW via provisioning tools like Ansible is usually seamless, giving us confidence that our servers are secure. However, there is a massive, often overlooked security

llms

Stop Paying for LLMs — Run Your Own Locally

If you’re tired of hitting limits, waiting on slow responses, or paying monthly just to use an online model, there’s a better option. With Ollama, you can run powerful LLMs directly on your own machine.

web performance

Why Your Page Feels Slow (and Hurts Your PageSpeed Score): Render Blocking and Critical CSS Explained

Learn how render blocking CSS slows your site and how Critical CSS can help you boost your PageSpeed score.

svg

A Simple Guide to SVG and How It Works

When building logos, icons, or illustrations for the web, SVG (Scalable Vector Graphics) is one of the most powerful tools in a developer’s toolkit. Unlike raster images (PNG, JPEG, WebP), SVG is mostly resolution-independent and code-driven, meaning your graphics almost always stay sharp, lightweight, and infinitely scalable without quality

linux

Story of a TCP Packet: An Intuitive Entrypoint To Linux Networking

This post traces a TCP packet’s journey through Linux, explaining interfaces, iptables tables and chains, and the networking stack with an analogy, example, and technical details for engineers.

tcp

How TCP and UDP Protocols Work: Understanding Their Critical Role in Internet Communication

How does data travel from a server to your screen in a split second? What is the logic behind it? What rules and protocols does it use that make it all work?

Go

Fan-In and Fan-Out in Go: Parallelism Made Simple

Learn how to distribute work across multiple goroutines and merge their results back into a single stream using Go's Fan-Out and Fan-In patterns. We'll break down these powerful concurrency patterns with practical examples you can use right away.

seo

Control the SEO Ecosystem: Tags, Sitemaps, Backlinks, and Who Really Controls Search

A practical guide to metadata, sitemaps, authority, search engines, and how it all actually connects

postgres

Turning PostgreSQL into a Robust Queue for Go Applications

How to build a reliable task queue in Go using PostgreSQL’s built-in features—no extra infrastructure needed.

LLM

LLM Fundamentals: How Large Language Models Work

Hello, I'm Maneshwar. I'm building *Free DevTools*, a single hub for developers with 50,000+ free resources, icons, cheat sheets, and TLDRs. No login, unlimited downloads.

seo

Is Your Website Fast Enough? What Google's Core Web Vitals Reveal

Want to know if your website is fast enough? Google's Core Web Vitals measure three key things: how quickly your page loads, how fast it responds to clicks, and whether it jumps around while loading. Fix these, and you'll rank better while giving users a smoother experience.

graphql

These Key Features of GraphQL make it Unique among Other API Technologies

When building modern applications, especially for mobile devices, how you get data from the server to the client is everything. For years, REST has been the standard for API design, but it often comes with frustrations. Let's look at the problems that led to a new way of