Well every day is different, isn’t it? No one knows what direction the SP will move next hour or next day unless you are “GOD”
What people can bet is the long term based on the products and fundamentals of the company. My take is that in general, if the product of the company is loved and used by all group of people, like NFLX, AMZN , AAPL..., then the future of the company is huge and worth for a long term bet.
Not an advice. This is just for myself and my own experience of learning long term investment on growth stocks.