Leawood911:

Me loves a roller coaster stock. It’s called a stop loss. Use it. 

Yes, Elon talks a good game but he is also an innovator and visionary. Not for the faint hearted though I must admit. Shorting Tesla scary stuff. 

However, if a stock plummets, a stop-lose does little to stem the loss, since all it does is start the sell process, not the sell price.