Dev.to
7/21/2026

The original title is "A Complete Guide to LLMs and AI Agents: From Tokens to Agents"
Original: 📘 The Complete Guide to LLMs and AI Agents 🤖 - Everything from how a word becomes a token to how an agent books your flight 🚀
Short summary
A comprehensive guide tracing how text flows through an LLM — from tokenization and embeddings through attention mechanisms, training, fine-tuning, RAG, and AI agents. Covers the full stack including vector databases, multi-agent systems, evaluation, production engineering, and safety. Aimed at engineers and learners who want deep understanding beyond surface-level usage.
- •Covers full LLM pipeline: tokenization → embeddings → attention → decoding
- •Includes training, fine-tuning, RAG, agents, evaluation, and production topics
- •Structured as a step-by-step walkthrough using 'Go to the moon' as example
Generated with AI, which can make mistakes.
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