This is on PPT a must read. I think traders wont like this but long term investors will surely like it.

Source of PPT.

Here are some basic Principle of Smart Investments.
1. Diversify, Diversify and Diversify
2. Start investing early
3. Invest in things you know
4. Avoid fads
5. Don’t let a market slump change your long-term investment plan
6. Don’t check the price of a stock (or mutual fund) after you’ve sold it
7. Pay attention to what’s going on with your investments
8. [...]

Lately you may have seen a slump in the real estate markets. Even if you wouldn’t have realized in the home price you may have seen few Infrastructure stocks which tumbled over 90% on the down side.
Now what people think that should we buy property at this rate or no ?
If you want to buy [...]

In times of economic decline, many investors ask themselves, ‘What strategies does the Oracle of Omaha employ to keep Berkshire Hathaway on target?’
The answer is that the esteemed Warren Buffett, the most successful known investor of all time, rarely changes his long-term value investment strategy and regards down markets as an opportunity to buy good [...]

Many people loose money by investing in stock markets and then they curse the markets.
So a suggestion is invest sensibly. Invest Smartly !
Here are few common mistake which people make.

No proper planning.
Aggressive Buying without knowledge about the company.
Aggressive Trading.
People keep on Trading in fact over trading.
No balance between various kinds of Investments.
Not Investing for long [...]

Investments are of various types and are in various forms. Not all investments are profitable , a few of them may be and few may not be.
Few investments are based on fixed returns and few are based on market conditions and of whose future cannot be predicted. There should be a balance between suck kinds [...]