To invest in Starbucks stock (SBUX), you can do so through a brokerage account. First, research the company's financial performance, news, and outlook to determine if it is a good investment for you. Next, open a brokerage account and deposit funds that you are comfortable investing in SBUX. Then, search for Starbucks stock using the trading platform and place a buy order for the desired number of shares at the current market price.