I have some questions regarding the basic mechanics of trading that I cannot find satisfactorily answered anywhere.
If my account balance is in USD then trades where the USD is the quoted currency make sense to me. For example, if the EURUSD is at 1.3000 then I understand that if I open a buy order, I am buying Euros with my USD, at $1.3 USD per Euro. Then when the Euro hopefully strengthens compared to the USD, I buy back USD at a profit.
However, what if USD is the base currency? For example what if I want to open a buy order on the USDJPY pair? Here, a buy order should mean buying USD with JPY, but I only have USD in my account. This implies I would first need to convert my USD to JPY, so that I would have JPY to buy USD, and since this doesn’t make any sense, I am certain I am misunderstanding something here.
The most confusing example is a cross-currency pair. If I want to open a buy order on the GBPJPY and my account only holds USD, then do I have to first buy JPY with my USD and then use that JPY to open the buy order and buy GBP? This would essentially be two forex orders simultaneously, would it not?
The most confusing part is that NO explanations or tutorials or videos I have found anywhere address how this all works, which suggests to me that I am somehow the only one who finds this all confusing. Obviously I understand the basic idea of buying a foreing currency in the hope that it will strengthen, at which point you can convert back to the original currency at a profit. However, the mechcanics of forex trading seem to go beyond that, though all explanations I can find do not go beyond the basic idea. People simply present that first basic idea, and then launch into discussions of buying and selling currency pairs without bridging the gap between those two concepts. I would really appreciate some explanations of the mechanics.