The core skill taught in these courses is "map reading." A PDF guide is excellent for reference on what specific hexadecimal changes mean in real-world driving conditions (e.g., spotting the smoke limit in a diesel map).
A is not for complete beginners. If you open a PDF about WinOLS or ECM Titanium without prior knowledge, you will be lost. Here are the prerequisites any serious training document should list: formation reprogrammation moteur pdf