Amazon is the biggest single stock holding I have. I bought it at around $300 and saw it climb twice to over $2K now. It made me so much money that it eliminated all of the losses I made with my stupid purchases. But I would not buy in at $1,7K per share. I don't think it will make you enough money. I'm getting out of picking stocks, but I made one exception when I bought ROKU at $41 a year back (It's at around $120 now). ROKU can make you stellar money or eventually crash. No way of knowing. If you want to play it safe, buy BRK.B, which is my second largest holding. Safer yet is low cost index funds. I have VTI, VOO, and VGT, and unless you have what the wealthy accountant calls f*ck it money, you need to be careful with picking stocks.