Soy sauce isn't just 'soy sauce'! When you are choosing what to cook with, take the same care as you do with oils. Is the soy sauce best for cooking, or is it a seasoning? How salty is it? How complex is the flavour?
Soy sauces are made and used differently in every country. Some are particularly salty, some are aged and best used in dressings or as a dipping sauce, and some are very richly coloured to give braised dishes their rich hue. Read our guide to the differences between Chinese & Japanese soy sauces to help you decide what to use. After that, it's best to try a few for yourself!