This is why, before entering the forex market, one should get a thorough understanding of the subject.
Do you mean trading forex?
Well, I am not a forex trader, but you may read this article:
https://www.forex.com/en/education/education-themes/trading-concepts/how-to-trade-forex/At least, you know at first about how to start trading forex, because it may be quite different from trading crypto (although it has actually similarities and also differences).
But basically, if you are asking here, you should ask about trading crypto. Because most people here may probably know more about crypto than forex.
Yes, before trading, whatever it is, you should know what to trade.
I always check on Coin market Cap in order to know what crypto and the lists of cryptos have high trading volume.
Then, there will be also some consideration about the fundamentals and also its analysis.
And if it is about trading crypto for beginners, you may check these videos:
https://youtu.be/mQvw5JXXnrQhttps://www.youtube.com/watch?v=tkz90RrnZZA