Check out the accompanying short blog series for more info...
Open up a terminal (e.g. in VS Code, or the command line in windows explorer).
Spin up the API.
Spin up the react app.
The front-end currently accesses the API via a hardcoded url (found in MyUsers.tsx).
const result = await fetch('https://localhost:5001/api/user');
You may need to access the api (defaults to https://localhost:5000) in your browser and add a security exception to permit requests to that url even though it doesn't have a valid certificate (just for testing locally).