What is a market pair? Base vs Quote currency - mankenavenkatesh - Medium
Direct Quote - Overview, Conventions, Implications
BabyPips - When buying, the exchange rate tells you how much you have to pay in units of the quote currency to buy ONE unit of the base currency. In the example
What's the difference between the base currency and the quote currency, and how do they affect each order? - Quora
How to Make Money Trading Forex & Read Forex Quotes