1. First of all, we must make clear our investment objectives, determine the investment period, and choose the appropriate investment method according to our investment objectives and period.

2. Secondly, we should understand the gold market, the changing trend of gold price and the risks of gold investment, so as to make better investment decisions.

3. Thirdly, we should choose appropriate investment channels, such as gold ETF, gold futures and gold spot. And choose the most suitable investment channel according to our investment objectives and deadlines.

4. In addition, we should pay attention to investment risks. Gold investment also has certain risks. Investors should choose appropriate investment methods according to their own risk tolerance to reduce investment risks.

Finally, we should insist on regular investment, which can effectively reduce investment risks, better grasp investment opportunities and get better return on investment.

The above is a detailed description of how to make the most cost-effective gold investment. Investors should choose appropriate investment methods, understand the gold market, choose appropriate investment channels, pay attention to investment risks, and insist on regular investment in order to obtain better investment returns.