Stock Trading can be done only through a broker who has registered himself by paying a caution deposit.
One Needs to have a Plan with due analysis and discipline to enter / target/stop loss along with deciding the mode intraday / Positional / Futures/ Options. with a proper analysis and plan it cant be termed a gamble. However as in every business, stock trading also has its rewards and risks.
Share price is decided by the Buyers and sellers and has no impact on the company’s financial status