Quick notes:
1. The execution speed of founders, the more ideas a startup company founder would go for a try and test it, even bounch of them ended up as failure, that's a good sign compared to those who always say they get great ideas but never go for testing it.
2. The market size matters, but maybe not the market size u can see going big currently. Let's say google, Facebook, back in 10 years ago, they didn't even exist or could be predicted becoming so huge at that time. So, try to calculate the size might grow in 10years might give u an idea if the company is worth of investing.
3. The personality of founder: if the founder of the startup company has something you do not like, let's say you don't even want to work with or spend time on them, better not go investing on it.
4. Gotta have a good product: try to measure if it is the product people would use it daily or even hourly, that's the sign it might be the next big thing.
Investing is not something to get rich quickly, it takes patience and passion, and always ask yourself, what's that you know more about than others ?
Dig deeper, then you might get build your own investing strategy.
