When buying ATH coins (or any other cryptocurrency), you should follow these principles to ensure that your investment decision is both wise and safe:

1. Understand the risks: The cryptocurrency market is highly volatile and uncertain. Before investing, be sure to fully understand the potential risks, including the risk of losing all your funds.

2. Do your research: Don't buy ATH coins blindly just because they sound attractive or because the price has risen. In-depth research on the project's background, team, technology, application scenarios, market prospects, and community support. Check white papers, social media discussions, professional analysis articles, forum posts, etc. to get comprehensive information.

3. Diversify your investments: Don't invest all your funds in one cryptocurrency, especially if you are not familiar with the market. Diversifying your investments can reduce the risk of a single project failing.

4. Set stop loss and take profit: Set clear stop loss and take profit points before investing. This will help you stay calm when market prices fluctuate and avoid losses caused by emotional trading.

5. Long-term perspective: Although the cryptocurrency market often experiences short-term fluctuations, long-term holding and paying attention to project development often leads to more stable returns. Consider your investment goals and time frame, and develop an investment strategy accordingly.

6. Pay attention to compliance and regulation: Make sure that your region allows the purchase of ATH coins, and pay attention to changes in relevant regulations and regulatory policies. Non-compliant transactions may lead to fund freezes or legal disputes.

7. Use a safe trading platform: Choose a regulated, reputable and highly secure trading platform for trading. Make sure the platform has strong security measures, such as two-factor authentication, cold storage, etc.

8. Be wary of scams and frauds: There are a large number of scams and frauds in the cryptocurrency market. Be highly vigilant about any project that promises high returns, requires private information or pays fees.

9. Continuous learning: The cryptocurrency market is a rapidly developing field, with new technologies and projects emerging in an endless stream. Maintain a learning attitude, pay attention to industry trends and new technology developments, so as to adjust investment strategies in a timely manner.

10. Rational investment: Last but not least, maintain a rational and calm investment attitude. Do not over-trade or invest emotionally because of short-term market fluctuations. Stick to your investment strategy and principles, and always focus on long-term goals.