Have some tips too!!
Don't use it if you are not sure it is legit. There are so many good and well-known ones that you shouldn't have to ask yourself that question
However, if you want to use a newer unknown exchange, check for:
Does the exchange has unrealistic promotions = probably scam
Does the exchange offer credit card and bank deposit = less likely a scam
Does it have a long history? (Check domain age for example)