Stock trading is a process to match a buy and sell order at the right price for the counter parties to either profit or loss from the transaction.
Demand and supply is assessed here while placing bids in the auction.
Trading is considered gambling as long as the risk reward ratio is not calculated by the trader
Long and short are two techniques in trading. Long – buy now for lower price and sell later for higher price.
Short is to sell at a higher price without owning the stock and buy at a lower price by end of day.