1. I joined Learn2Trade, where they provide 5 suggestions per day, on whether to BUY or SELL.
2. I understand how to BUY and wait for the price to go up.
But I don't understand how you make money on SELL.

For example, let's say I believe BTC will go down. So I BUY BTC. And then I wait for it to go down and then SELL.
Don't I lose money?