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?).
Just don't sell bitcoins(or other coins) if you bought for higher price than it currently is, that would be really bad idea, and you'd lose your money. Just try not to panic, think smart about it. I mean price will come back up again, you just have to wait a bit.
What you can do is to buy even more coins though, if their price is really low. This way you'll get even more profit once price rises up again.