Only a few times, trading in the market... But I realized that in most cases there were trades that could have been avoided, by just paying attention to identify the bad calls.
This is right. Trading is all about the experience and knowledge. if you know when and where you need to trade. which sites are legit and which are not.
which altcoin should be chosen and which not. then you'll not loose your money ever.. it is all about the skills.