By aggressively trading on margin he can produce 5% daily profits on the 100k buying power he will grow their 25k cash at the rate of 20% per day. The risk of course is that he will make a mistake that will cost him everything. Unfortunately, this is the fate of 9 out of 10 traders. The cause of these career ending mistakes is a failure to manage risk.
You need to understand basic day trading terminology & concepts to build your foundation. You can follow me on Youtube to get free education! Join the community of thousands of followers on YouTube and begin studying the free content we post on a daily basis. This is the beginning of your education. You need to study the markets, analyze charts, and learn the strategies professional traders are using every day.

To succeed as a day trader, it is important to know how to pick stocks for intraday trading. Often people are unable to make profits because they fail to select appropriate stocks to trade during the day. Choosing the right stocks to book profits is an art that you will learn with experience. For beginners, here get some tips to choose stocks for intraday trading.
Commissions for direct-access brokers are calculated based on volume. The more shares traded, the cheaper the commission. The average commission per trade is roughly $5 per round trip (getting in and out of a position). While a retail broker might charge $7 or more per trade regardless of the trade size, a typical direct-access broker may charge anywhere from $0.01 to $0.0002 per share traded (from $10 down to $.20 per 1000 shares), or $0.25 per futures contract. A scalper can cover such costs with even a minimal gain.
A day trader often closes all trades before the end of the trading day, so not to hold open positions overnight. A day traders' effectiveness may be limited by the bid-ask spread, trading commissions, as well as expenses for real-time news feeds and analytics software. Successful day trading requires extensive knowledge and experience. Day traders employ a variety of methods to make trading decisions. Some traders employ computer trading models that use technical analysis to calculate favorable probabilities, while some trade on their instinct.
When you start day trading you’ll have a host of difficult decisions to make. Should you be using Robinhood? What about day trading on Coinbase? Do you have the right desk setup? Where can you find an excel template? How do you set up a watch list? The meaning of all these questions and much more is explained in detail across the comprehensive pages on this website.
Successful traders have to move fast, but they don't have to think fast. Why? Because they've developed a trading strategy in advance, along with the discipline to stick to that strategy. It is important to follow your formula closely rather than try to chase profits. Don't let your emotions get the best of you and abandon your strategy. There's a mantra among day traders: "Plan your trade and trade your plan."