React Project Testing Apps

Hi my question is that i want to test the apps i have created here just to get familiar with the concepts, so i want to try them out in my vs code editor and play around with them mostly what im learning from here so i can get a better understanding of react.js, my issue is i dont want to create multiple apps as i would have a huge react apps taking up space, what i want to know if i can have them in one project and run them individually from one project by having several folders with mini apps to test and learn. I have tried this but throws an error index.html file not found i understand thats it loacted in the public folder, but most of the projects have there own index.html files, so what can i do to make these work for example the ranenous project, jamming project ect… all be in one create react app project.

thanks