Are you wanting people to share their stories of how they've been scammed? And it's pretty easy to avoid: just don't send your money to scammers.
yes i wanted to know how they've been scammed...
just don't send your money to scammers
.... how i can find that he is a scammer
Common sense can go a long ways on it. Does it sound to good to be true, are they promising a huge return, etc. Use escrow on trades, especially if low trust or new person you are buying from.
Other things on miners try to use a company with a long history, and also try not to pre-order.