Building RAG Assistant: A I Built a Desktop RAG Chatbot From Scratch — Here's Everything I Learned

This week I moved past basic tutorials to build a structured, package-based desktop RAG application with dynamic document ingestion, a custom GUI, and a modular Python backend. When starting out with Generative AI and Retrieval-Augmented Generation (RAG), it's easy to fall into the "what is this and what am I even doing" beginner trap. You run the tutorial, it works, you feel great - and then you have no idea how to build anything real with it. Inspired by Pixegami's foundational LangChain RAG tutorials, I decided to take things further.