1-One of the most important principles of investing is to think long term. Focusing on how your investment will perform over the long term, rather than short-term fluctuations, generally produces higher returns. Long-term investors are more resilient in the face of market fluctuations and can make big profits thanks to their patience.
2-When investing, it is critical to analyze whether the company has solid foundations. Companies that are well managed, have continuous growth potential and have a solid financial structure are ideal for investment. When assessing the company's future potential, it is important to consider factors such as its adaptation to technological innovations and its position in the market.
3-In the investment world, it is more important to "spend time" in the market rather than waiting for the "timing" to be perfect. It is often better to keep your investment in the market for a long period of time rather than trying to time it perfectly.
4-Patience is one of the most valuable virtues when investing. Being patient and not panicking about sudden changes in the markets is the key to long-term success.
5-The investment world constantly changes and develops. To be a successful investor, you need to be in the process of constantly learning about the markets and improving yourself.
6-It is important to make your investment decisions with your logic, not your emotions. Instead of making emotional decisions in the face of market fluctuations, use your analytical thinking skills.
7-Diversifying your investments is one of the most effective ways to reduce risk. Instead of tying all your capital into a single investment instrument, spread your risk by investing in different sectors and asset classes.
8-The most valuable asset you have when investing is your own knowledge and skills. Investing in yourself helps you understand the markets better and make more informed decisions. This might mean getting financial education, attending seminars, or reading books about investing.
9-Successful investors do extensive research before investing. Analyzing companies' financials, industry trends and economic indicators should form the basis of your investment decisions.
10-Every investment has a risk and managing these risks should be a fundamental part of your investment strategy. Determining your risk tolerance and investing accordingly protects you against unexpected market fluctuations.
11-Setting clear goals when investing increases your motivation and helps you shape your strategy better. Determine your long-term and short-term goals and make a plan to achieve them.
12-Instead of following other people's strategies, create your own investment strategy. This strategy should suit your personal goals, risk tolerance, and investment duration.
13-Movements in the markets are shaped not only by economic factors but also by human psychology. Understanding investor behavior and market psychology helps you make more informed investment decisions.
14-Following market news and developments is an indispensable habit for investors. Economic reports, company news and global events can influence your investment decisions.
15-Making mistakes is inevitable when investing. The important thing is to learn from these mistakes and use your experiences to make better decisions in the future.
16-Market conditions change constantly. It is important to be able to flexibly adapt your investment strategy to market conditions and your own goals.
17-When investing, it is important to maintain a long-term perspective against short-term fluctuations. Being patient and focusing on the big picture maximizes returns on investment.
18-The investment world constantly evolves. Staying informed about new trends, technologies and strategies is key to improving your investment skills.

Note:The information here has been prepared from books.