Another option is SkillReactor, which also lets you build a professional portfolio through project-based learning. It supports a broad range of technologies, including OpenAI, HTML, CSS, React, Vue and more. SkillReactor offers interactive learning, just-in-time content and industry-level feedback through code reviews, and is useful for beginners and pros who want to improve their coding abilities and build a strong portfolio. A subscription starts at $0.99, so it's a relatively low-cost way to advance your career.