Different measurement systems are used in different countries (such as Imperial, US Standard, and Metric), and different ways of measuring ingredients. The most important difference one may encounter is whether dry ingredients are measured by weight (e.g. ounces, pounds, grams, kilograms) or by volume (e.g. tablespoons, cups, milliliters, liters). For example, cooks in the United States tend to measure all ingredients by volume, while it is common in Europe to measure dry ingredients by weight and liquid ingredients by volume. This creates a lot of confusion and the best suggestion I can give is to immediately convert all the recipes you find on the Internet to your measurement system before even considering making it.