Did anyone actually make money with crypto in 2018?
Edit: https://help.cointracker.io/taxes/us-taxes/do-wash-sales-app...
You can short established coins like BTC and ETH.
There are also so called "flip seasons" where you throw money at random small cap altcoins and flip them 30-200% higher over the course of a month. These happen whenever BTC settles down and consolidates before plunging to news lows.
You can, but it's hard to find reputable vendors that offer this that aren't bucketshop scams.