New Developer - Unsure how to Integrate API

How does one “make a request to the Get Streams endpoint”?

This is what I’m trying to resolve here - I haven’t found any useful information to answer that question throughout days of research. I know the question in it’s nature is very “noobish”, and I’m assuming an experienced developer knows exactly what you’re saying, but as someone who’s moving from simple web development to API Integration I have no idea what the answer to the above question is. Any feedback would be greatly appreciated!