Hello. I have a folio of BTC, ETH, NEO and some alts. I've been watching at Bitcoin since 2015 but bought only at this summer (and the last move was quite bad, I bought some BTC for $4600). I try to study, watch vids, read forum and twitters. Chris Dunn has a vid on the topic but nothing really specific. I'm interested in some ideas about what to do when prices are falling. Sell alts and hold bitcoin? Short? (and if yes, so the next question is how to learn how to short?).
If you want to ensure that you can earn profit, just hold all of your coins even the cryptocurrency market is going down. Holding is very effective way for us to easily double our money.