데이 트레이딩을 진지하게 하려면 자본은 얼마나 필요할까? 💸

Don’t use your own capital to start. Practice in sim and when you are ready, practice with a prop firm
And work toward a payout. If you can’t earn a payout with a prop firm, you can’t make any money with your own capital. You will simply lose it. Consider using some of your own money a couple/few years down the road once you can prove you are profitable for 6-12 months.

Depends what you mean "seriously". I view it in 3 phases.

1) $0 - Paper trading. Trade in a sim and build something out until you're consistently profitable (or would otherwise be if your orders filled roughly where you placed them - paper orders aren't filled very fast in my experience with Alpaca and Webull paper trading).

2) A couple hundred/thousand dollars in a CASH account. Once you put real money in it, your orders and emotions will behave differently than paper trading. Start with a couple hundred/thousand bucks and make SMALL trades so that you don't run out of buying power. In a cash account, each trade adds up, so if you have $1,000, you can trade $100 a maximum of 10 times before you have to wait until the next day where the funds have settled. You can trade $500 only twice. $200 5 times, etc.... You can't make as many trades as you like until the funds settle. This is intentional to keep your emotions in check as you ease into it and reflect on your behavior.

3) Above $25,000 is the current threshold to not be restricted to the PDT (pattern day trade) rules if you have a MARGIN account. In a margin account, you can trade as many times as you want without having to worry about stopping to let things settle. This is good if you're wanting to trade large chunks of your portfolio several times a day that would otherwise add up to more than your portfolio value.