Currencies, Stocks, ETFs: Comparing Asset Classes

Currencies, stocks, ETFs. Very often, when a trader is called upon to decide what to invest in, the choice falls on these asset classes. After all, the Forex, stock, and ETF markets enjoy a lot of visibility, despite the spread of cryptocurrencies (which is significant anyway).
It is therefore worth making a comparison between the three asset classes, providing some coordinates about their dynamics and illustrating both the pros and cons. In this way, traders can gain orientation for decisions to be made as soon as possible.