Group 1 - The article emphasizes that avoiding five common investment mistakes can help individuals outperform 90% of retail investors [4][28] - It highlights the importance of relying on common sense rather than expert opinions, noting that 75% of fund managers fail to beat the market [7][8] - The article suggests that familiar companies are often the best investment opportunities, as they are well-known and trusted by the public [10] Group 2 - It warns against using leverage for investments, citing a case where a leveraged investment led to a massive loss of $20 billion in just two days [12][13][14] - The article advises against chasing popular stocks, as this often leads to significant losses when the market corrects [15][16][18] - It criticizes frequent trading, stating that each transaction benefits brokers more than the investor, and encourages a more patient investment approach [19][21][22] Group 3 - The article argues that attempting to predict market movements is futile, as even the most powerful financial figures have failed to do so [23][25][27] - It concludes that successful investing is about making informed decisions and holding onto quality investments rather than trying to time the market [28][30]