As there are many connected things stemming from the bid/ask price David covers them as well, to provide a more holistic description of the term.
The exact terminology, its place on a chart, how to interpret it is discussed in a simple and easy to grasp way before continuing to a bit more advanced things like liquidity and illiquid instruments, different types of spread. But everything is accompanied with real market examples and shows things exactly as you’ll find them in the Trading 212 platform whether on a laptop or in our trading app.
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