Hello Sam, welcome to Quantopian!
Different people want different performance from their algorithms - you can probably get a wide variety of answers from members of the community. For Quantopian's purposes, however, we are looking to allocate money to a very specific set of performance characteristics. You can read about what we're looking for on our fund page.
I don't have an example for you that is "click here, this one makes money." There are a lot of things shared on Quantopian, but the best money makers tend to stay secret. But the basic mean reversion example has a lot of key ideas in it that will get you started.
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