Interaction-design.org's UX Design Courses are great and I highly recommend them to anyone who is new to the field or who wants to improve their existing knowledge. This organization provides courses in various areas (research, visual design, design thinking process, accessibility, interface design, etc.) and therefore it is possible to choose exactly what interests you. What I appreciate about the courses is their great content and variety, different forms of content such as text or video, and last but not least, the large amount of information you take away. I am glad that I started taking the courses regularly, it helps me to improve my work processes.