All coins (for the moment at least) orbit around bitcoin and will be influenced by whatever happens to bitcoin. This will alter over time as Bitcoin becomes a smaller and smaller proportion of the total crypto market cap.
That is what I am thinking about.
It is all about mentality and sentiment.
Whenever bitcoin crashes, altcoins crashes harder.
Whenever bitcoin pumps, altcoins pumps harder.
So we should know what to do when crash happen next time.