TL;DR: "B" = billions of parameters. "IT" = instruction tuned. "Q4_K_M" = 4-bit quantization, a common default. "GGUF" = the format for Ollama and local tools. "MoE" = only a fraction of parameters activate per token. This guide decodes every component of LLM model names, explains quantization formats and file types, and points you to the best...