I appreciate the answer. I'm having trouble wrapping my head around it. Let's say I use a date range of 30 days for my backtest. I would like to know, if it starts out with 100$, how much will it end up with after the 30 days. Annual return is estimated I assume. What is the best way to look at this data to determine if it would be profitable? Forgive my ignorance I don't have much of a finance background.

If this it hard to understand.. if a strategy makes 10% per year, why does the starting capital affect the outcome? Shouldn't it return be 10% of whatever capital is put into it?