UX and UI both are different but compliment each other. However mastering on both of them could be time taking as when it goes into deep you can not handle both at a time

For getting introduced with UX you can refer resources like Home | Usability.gov It gives you understanding of different elements in User Experience. Each element and step has it's own depth to master on it. For e.g. User Research, IA etc.
Have a good understanding Design Fundamentals. What are the principles of design as a whole. This will help you to understand the Design as method or phylosophy and it's wide spectrum

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