I see a lot of people talking about when to sell; but I think that buying is as important if not more (obviously you but low -_-). so do you guys aim to buy the lowest low of the day/week/month/... and do you think that is riskier and/or hard to predict. do you wait for price reversals? do you follow expert advice?? please share your thoughts and your stories (successful or otherwise 
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Depends on the situation, a 7-14 day lowest would be a good time to buy but try to check if its already over sold, check the reason why the price is dropping. )This is the most difficult one to do.
Looking for a reason why is dumping? Mostly its happen because of news. So how if there is no news?
So sometime people just buy without searching why because its difficult so they prefer to do blind trading.