1. Coursera: offers a wide range of online courses taught by renowned professors and experts from top universities and companies. It covers various subjects, including technology, business, data science, social sciences, and more.
2. Udacity: Known for its nanodegree programs that focus on technology-related skills, such as artificial intelligence, machine learning, programming languages, and data analytics. They provide practical learning experiences and prepare individuals for in-demand jobs.
3. edX: Similar to Coursera, edX offers online courses and degrees from leading institutions like Harvard, MIT, Berkeley, and others. It covers various subjects, including computer science, engineering, business, humanities, and more.
4. LinkedIn Learning (formerly Lynda.com): Mainly focused on professional development and business-related skills, LinkedIn Learning provides video courses taught by experts. Topics include software, creative skills, leadership, management, and more.
5. Khan Academy: Offers a vast collection of free online courses and resources covering a wide range of subjects, including math, science, computer science, history, art, and more. It's widely used by students and teachers worldwide.
6. Udemy: A comprehensive platform that allows individuals to teach and share their knowledge through online courses. It covers a diverse range of topics and includes courses created by both experts and enthusiasts.
7. MasterClass: Offers exclusive online classes taught by renowned celebrities and experts in their respective fields. Topics include acting, cooking, photography, sports, writing, and more.
8. Skillshare: Another popular platform that provides online classes and workshops on creative and practical subjects such as design, illustration, photography, marketing, and personal development.
9. Pluralsight: Primarily focused on technology-related courses and paths for developers and IT professionals. It covers programming, cloud computing, security, data science, and various software development topics.
10. FutureLearn: Offers online courses from top universities and cultural institutions around the world. It covers a wide range of subjects, including healthcare, psychology, business, literature, and more.
Note that "best" can vary based on personal preferences, specific learning objectives, and learning styles. It's always a good idea to research and compare different platforms to find the one that best suits your needs. Additionally, many reputable universities also offer online courses and degrees, so you can explore options from them as well.