The document provides tips to avoid common investment mistakes. It lists 6 mistakes to avoid: letting emotions run wild, investing in something not understood, becoming too attached to a company, unrealistic expectations, trying to time the market, and failing to diversify. It then gives steps to develop an investment plan including determining goals and seeking advisor help if needed. It stresses maintaining a long-term consistent strategy, monitoring investments, and adjusting the portfolio over time based on life stages. It also recommends setting up a small "play fund" to allow for riskier investments as long as it's limited and comes with rules. The overall message is to commit to an investment plan and follow best practices to successfully build a portfolio.