To test frontend on your local computer:
(first make sure .env file in frontend folder is set up)
cd frontend #make frontend the root folder
npm install #installs required node_modules
npm start
the app will now be running at http://localhost:3000/
To access the Strapi admin panel on your local computer:
(first make sure .env file in backend folder is set up)
cd backend #make backend the root folder
npm install #installs required node_modules
npm run build #builds admin panel
npm run develop
the Strapi admin panel will now be running at http://localhost:8058/admin
(you will need your email and password to log in)