Udemy: best for specific technical skills on a budget. 200,000+ courses. Purchase individually ($15–25 during frequent sales), own permanently. Check rating (4.5+ stars), student count (10,000+), and review recency before buying. LinkedIn Learning: best for professional development and career advancement. $40/month or free with many public library cards. Completed courses display on LinkedIn profile. Check your library first. Coursera: best for university-level credentials. Partners with Stanford, Google, IBM. Google Career Certificates (Data Analytics, UX, PM, Cybersecurity) are employer-recognized. More expensive and structured with deadlines. To choose: Specific skill + tight budget = Udemy. Corporate career + LinkedIn profile = LinkedIn Learning. Employer credential or academic depth = Coursera.