Others have mentioned "learn by doing," which I think is absolutely necessary. At the same time though, it doesn't help if you start off doing it wrong, bringing assumptions about how a company works that are based on big-tech.
Having spent a decent chunk of my career at both start-ups and at a Big Tech company, there are lots of things that make sense to do at one that don't make sense at the other. As you make the move yourself (or, if you hire others, as you onboard people who are making that move), it's important to keep in mind how the risks are different between large companies and small companies. That probably doesn't answer your question directly looking for books or resources, but I think it's important to keep in mind as you consume books or resources.
Having spent a decent chunk of my career at both start-ups and at a Big Tech company, there are lots of things that make sense to do at one that don't make sense at the other. As you make the move yourself (or, if you hire others, as you onboard people who are making that move), it's important to keep in mind how the risks are different between large companies and small companies. That probably doesn't answer your question directly looking for books or resources, but I think it's important to keep in mind as you consume books or resources.