In simple terms, both are the same, and knowledge about trading can be used in both trades. Only for crypto, you have to know about market conditions before opening a position because this is quite important and crypto trading is quite full of speculation, while stock trading will be safer because the regulations are certain, it's different in crypto especially if you trade in altcoins which are full of fraud so if you don't first find out more about the coin it will only lead you to losses., and in stock trading you trade stock of companies whose existence is clear while crypto is all only available online which could be a fake.