Have you noticed how well Tesla stock has been doing lately?

I don’t own any shares, but Tesla is among the stocks I keep tabs on just out of curiosity. Tesla did awful last year, but in the last month it has gone up by about 50%. For those who play the stock market, there is a tendency to buy a stock when its price drops, but I read somewhere that you do better by buying when the price of the stock is going up, since it is likely to continue doing so. If I had followed that advice for Tesla I would have done quite well.