Use limit orders

• There are two types of buy and sell orders for traders: market orders and limit orders. Market orders execute the trade immediately at the current price. Limit orders are used to specify price and will not be executed until the price is reached. Traders can lock in profits during the day by buying shares and locking a stop-loss order once the price has risen.
  
  

Go short

• If you are sure a stock will be trading lower during the day, you can sell that stock short. Short-selling involves borrowing a security from another party and buying it back later. Since you're selling now and buying later, you'll obviously want the price to decline to generate a profit. Short-selling is considered very risky and it involves carrying costs since you must pay interest on the borrowed shares.
  
  

Watch the volume

• The volume of trading in a particular security is of particular interest to day traders. High volume tells traders that the current move a stock is making (up or down) is a strong move. Low volume indicates that the move is weak and likely to revert to the previous trend. Intraday volume indicators let traders make informed decisions to buy when stocks dip on low volume or to short stocks when they shoot up on low volume.