Whilst some day traders are tuned in every day from 09:30 to 16:30 EST (for the U.S stock market), many trade for just a 2-3 hour window instead. As a beginner especially this will prevent you making careless mistakes as your brain drops down a couple of gears when your concentration wanes. The hours you’ll want to focus your attention on are as follows:
A broker is simply a licensed person through whom you can buy and sell these stocks. When you use an online platform, it essentially acts as an online broker. If someone wants to buy any product, he can contact a brokerage service. They would place an order and let him know the market price of the product. If the investor is interested, they would include a commission for themselves and process the order forward. If the user wishes to buy stock, the broker would forward his order to a stock exchange, which would approximately take 3 days to complete including the money exchange between the broker and the investor.