Get data and media for image slider

I’m currently working on an image slider for my website, which I build using Strapi and Next(React.js).
I’ve started some time ago with the Strapi tutorial “Build a blog with Next (React.js) and Strapi”. The file structure and the backend stayed the same since then.
But now I want to get the title, a description and an image for my already existing Slider from the Strapi backend and I don’t really know how to do this. Can someone please help me with this problem?
If you need more informations about my project I will of course edit this topic.