File: frontend/src/*.js (multiple files)\n\nIssue: API endpoints are hardcoded to localhost:5000\n\nDifficulty: Medium\n\nWhat to do:\n1. Create .env file with REACT_APP_API_URL variable\n2. Replace all hardcoded URLs with process.env.REACT_APP_API_URL\n3. Test in development and production\n\nFiles to fix:\n- App.js\n- pages/Home.js\n- pages/Students.js\n- pages/Courses.js
File: frontend/src/*.js (multiple files)\n\nIssue: API endpoints are hardcoded to localhost:5000\n\nDifficulty: Medium\n\nWhat to do:\n1. Create .env file with REACT_APP_API_URL variable\n2. Replace all hardcoded URLs with process.env.REACT_APP_API_URL\n3. Test in development and production\n\nFiles to fix:\n- App.js\n- pages/Home.js\n- pages/Students.js\n- pages/Courses.js