One of the biggest indicators is sudden change in volume and a majority of buy orders. But this can also be artificial, where miners suddenly change to a new coin.
Yes, this is true but what you can use is of you look at past volume and you notice there has been some level of occassional accumulation and some youtube channels are talking about it like the best new deal in town
Exactly. When you notice that somewhat the volume has risen to dramatic number in few hours and check the trollbox, if you are familiar with it, look for signs that a lot of people are suddenly talking about that coins and creating a lot of hype around it. Just be careful and very quick because this pump and dump group works in unison with one another. If you see that there are massive buy then they are dumping it right now. You don't want to be trap and next to exit in time, so just be cautious and act fast.