Assuming you're asking what the best investment strategy is for an initial investment of $10,000 - $15,000, there are a few things to consider.
First, what is your investment time horizon? This will affect what types of investments are appropriate for you. For example, if you're planning on retiring in 20 years, you'll have a longer time horizon than someone who is planning on retiring in 10 years. This means you can afford to take on more risk, since you have more time to recover from any short-term losses.
Second, what is your risk tolerance? This will also affect what types of investments are appropriate for you. If you're risk-averse, you'll want to focus on investments that are less likely to fluctuate wildly in value, such as bonds. If you're willing to take on more risk, you can invest in stocks, which have the potential to generate higher returns but also come with more risk.
Once you've considered your time horizon and risk tolerance, you can start to look at specific investment options. If you're comfortable with risk, you may want to consider investing in a stocks or stock mutual fund. These investments have the potential to generate higher returns over the long term, but they will also be more volatile in the short term. If you're looking for a less volatile investment, you may want to consider bonds or a bond mutual fund. These investments tend to generate lower returns, but they are also less likely to fluctuate in value.
No matter what investment strategy you choose, it's important to remember that you should never invest more money than you can afford to lose.