You gotta use FIFO, and there are records for your buys/sells. You’ll actually receive a 1099 from Coinbase/GDAX if your sales exceed $20,000.
I learned a ton from my experience. This latest news about Tether is different from your standard FUD. There’s strong potential for a huge correction now.
It’s important to pay attention to Reddit to get a good impression of how all the different crypto communities react to things to help make judgement calls. Looking at where BTC is right now, I just managed to avoid big losses.
If I decide to invest again once I see the new bottom, I think I’d invest mostly into ETH. ETH prevented me from going into the red, I like how useful it is, the vast amount of projects related to it, and how it’s been reacting to FUD & this whole Tether ordeal.