Pips

To Start trading in forex market every trader must learn
about pips, price charts, Stochastics… Where should I start?

Read all 10 parts of this before you consider putting a $0.01 into the market: Forex Tutorial: Introduction to Currency Trading | Investopedia

You have to know all; pips, spread, prize trends, trend direction, charts and how to study charts
How to trade news, support and resistance; in fact you have to know it all to be able to workout a good trading plan that works
And to make long term profit.

Indeed, prize trends are key.