Best online resources for self-learning

Khan Academy offers free tutorials and resources on a variety of topics, including math, science, and programming. It is a fundamental resource for reinforcing basic knowledge or learning new subjects from scratch, with a clear and accessible approach.

Udacity specializes in programming and technology, offering 'Nanodegrees' developed with leading companies like Google and IBM. Its focus on practical skills and real projects makes it highly relevant for acquiring in-demand technological competencies.

Codecademy offers interactive courses for learning to program in various languages, with a practical approach and in-browser exercises. Its interactive methodology is very effective for beginners who want to start writing code from day one.

Coursera is a leading platform offering courses, specializations, and degrees from prestigious universities and companies. Its wide academic offering and the possibility to audit many courses for free make it ideal for structured self-taught learning.

Founded by Harvard and MIT, edX provides access to free online courses from some of the world's best universities. It is a benchmark platform for high-quality academic learning, ideal for self-learners seeking university-level knowledge.

freeCodeCamp is considered the best free platform for learning to program, offering a structured curriculum and verified certifications. It is an unbeatable option for those looking to become web developers with a practical approach and real projects.

Harvard's CS50 is the world's most famous university course for understanding the fundamentals of programming and computer science. Accessible at no cost through edX, it provides a solid and rigorous foundation for beginners.

The Odin Project offers an open-source curriculum that guides students from zero to fullstack web developers with real projects. Its practical and project-based approach makes it an excellent resource for building a portfolio.

W3Schools offers free tutorials and resources on a variety of web-related topics, including HTML, CSS, and JavaScript. It is a constant and updated reference for quickly learning and consulting web technologies, ideal for self-taught learning.

Duolingo is known for its gamified approach to language learning, with short and fun lessons that maintain motivation. It is one of the most popular and accessible apps to start learning a language or practice daily.

Skillshare is ideal for learning creative skills in a practical and fun way, with courses on design, illustration, photography, and video. Its focus on practical projects and community participation are key to self-taught learning.

Memrise ranks well on the list of free language learning apps, offering learning through videos of native speakers and interactive exercises. Its focus on contextualized vocabulary makes it very effective for improving comprehension and fluency.

Brilliant is an ideal application for those who enjoy solving math, logic, and other problem-based challenges. Its interactive approach makes it very effective for developing critical thinking and quantitative skills.

OpenClassrooms offers over 650 free access courses in various professional areas such as business, data, and marketing. It is a solid option for professional skill development with a large amount of free content, ideal for continuous improvement.