Tip 2: Pay attention to economic indicators and market news, such as CPI and interest rates. However, sometimes I struggle with interpreting the news. So, my usual move is to watch someone else interpret it. You don't necessarily have to follow their advice, but they can help provide basic information like why something happened and what caused it. As for the future, no one knows for sure.
TeslaSmurf : Good.
Of course, everybody has to do his own RESEARCH, develop a STRATEGY according to his experience, keep refining it and, when it constantly works (=makes you money), just stick to it and improve it. Diversification is not a strategy and it is not good by itself but it certainly helps reducing the risk. Too many companies are difficult to follow (data, news, etc) and, in case, ONE company per specific sector is generally enough. As for the long term portfolio 1 to 3 stocks are enough if well chosen. For day trading you can vary more, of course, according to which novelties and opportunities the market may bring.