Don't follow the herd. Do your research and stay invested. Don't sell just because people around you are doing it.
Decide how much growth a stocks price can make over the next few months and decide a target. If the stock reaches the target, book partial or full profit so that, in case the stock tumbles, you don't end up with a full red portfolio.
Stay away from penny stocks. It is better to buy the shares of a good company with solid fundamental Have a diversified portfolios.
Don't be afraid of making losses. Every person who claims he is a stock market guru would have incurred losses at some point of his life. The trick is to avoid greed and make wise decisions that can bring profit to us.
Good luck and safe trading!