This book outlines the basic concepts of investing in oil and natural gas through financial derivative products called ETCs. In particular, the following topics are covered: classification of financial products and general properties such as liquidity, availability, volatility, risk, derivative products, leverage calculation of simple interest, compound interest and percentage mathematics costs of financial products, taxes and profits characteristics, types, risks and costs of ETCs uses and markets of oil and natural gas parameters affecting oil and natural gas prices such as production, consumption, stocks, geopolitical factors, speculation, correlations portfolio management strategies examples of investing in oil and natural gas through ETCs Each topic is covered from a practical and operational point of view, going on to explicate significant numerical examples.