Following are the general advices for the new investors by stock market gurus:

Have a clear understanding of the financial implications of the stock market investments, just like returns there may be high exposure to risks also.
If you are a day trader then focus only intraday trading, better to avoid mixing delivery and day trading. Always operate with a clear stop loss trigger to minimize the unexpected loss.
Invest only a part of your savings in the stock market and build your positions slowly over a period of time.
Never indulge in over trading, if the market crashes by 5% on a single day, don't buy stocks in a hurry in huge volume. Markets are going to be there and there may be further fall on the consecutive days. So keep some reserve cash position and buy on the next sessions.
Don't panic when the market slides, sometimes it will be so difficult to digest the fact that total networth would have been reduced by 30% to 40% within few days or weeks. Try to hold for some months, if possible some averaging can be done.
Be careful about stock tips from various sources like free SMS stock tips or free trial of stock tips through email or intraday calls provided by stock brokers. Make your own analysis before investing whether it is paid stock tips or free stock tips. No one can be perfect in short time speculations. The validity of the stock tips also should be checked as some may change every hour also based on some market news or rumor like stock bonus issue, share buy back etc.,
Some brokering firms give Multibagger stock recommendations. The Multibagger stock tips works well for long term investor and the investor may go through the stock analysis report and study and get convinced about the financial position of the company.
It is advisable to invest in various stocks from various sectors so that at any point of time some sectors will be doing well.
Profit may also be booked at regular stages depending on the goal like 10%, 15% or 20% gain. The investor may re-enter when the stock goes down or switch over to any new stock.
Investing in stock market with loans or credit should be avoided at any stage, even if the market valuations are very attractive, don't invest unless you have surplus funds.
Try to learn the technical analysis through analysis software of stocks, if you want to become a serious investor - Many experts feel that the software to monitor
the resistance and support level of the market index was able to predict the recent
market crash well in advance.
Investor may also learn about option trading and take positions on cash(delivery segment) and option contracts by suitable call or put options. This way the investor may make gains irrespective of the fact whether market moves up or down.
Watch out of Govt. policy changes, which may have great impact on the sectors, like the recent Govt. ban on export of Cement, brought down the stock prices heavily. This kind of awareness will help the investor to make swift action.
Results season is also one of the periods where the investor should trade cautiously, at sometimes, even if the results are good, the stock will side on the declaration of the results, as the market would have already factored that in prior trading sessions. Similarly, some stocks may move up even if the results are bad, as lot of traders would have sold expecting the worst in prior sessions. So going short on such stocks with speculation should be avoided.
It is ideal for the investor to follow proper trading strategies. New investor can enter stock market with Mutual Funds then venture into cash trading, margin trading and Future and Options trading. The investor should keep a close watch on the Global market conditions to take proper proactive measures to safeguard his investments.