Udemy (specific skills, budget): 200k+ courses, buy individually ($15–25 in sales), own permanently — check 4.5+ stars, 10k+ students, recent reviews. LinkedIn Learning (professional development): $40/mo or free with library card, completed courses show on LinkedIn profile. Coursera (credentials): 300+ university partners, Google Career Certificates are employer-recognized with job placement support. To choose: specific skill + tight budget = Udemy. Corporate career + LinkedIn visibility = LinkedIn Learning. Employer/academic credential = Coursera. Check your public library for free LinkedIn Learning access first.