What you MUST do in stock market trading

1. Get rid of the junk

Any shares you bought but no longer want to keep? If they are showing a profit, you could consider selling them. Even if they are not going to give you a substantial profit, it is time to dump them and utilize the money elsewhere if you no longer believe in them.
Similarly with a dud fund; sell the units and deploy the money in a more fruitful investment.

2. Diversify

Don't just buy stocks in one sector. Make sure you are invested in stocks of various sectors.
Also, when you look at your total equity investments, don't just look at stocks. Look at equity funds as well.
To balance your equity investments, put a portion of your investments in fixed income instruments like the Public Provident Fund, post office deposits, bonds and National Savings Certificates.
If you have none of these or very little investment in these, consider a balanced fund or a debt fund.

3. Believe in your investment

Don't invest in shares based on a tip, no matter who gives it to you.
Tread cautiously. Invest in stocks you truly believe in. Look at the fundamentals. Analyze the company and ask yourself if you want to be part of it.
Are you happy with the way a particular fund manager manages his fund and the objective of the fund? If yes, consider investing in it.

4. Stick to your strategy

If you decided you only want 60% of all your investments in equity, don't over-exceed that limit because the stock market has been delivering great returns.
Stick to your allocation.