UX is a lot more than just wireframes, or even websites or apps. It’s trying to understand how someone will use something, and building around that. It’s used in websites for designing to improve conversions. However if you want to learn, it would be better to study the behaviour of customers and people, and how they go about doing things.
If you for example are building a website for doctors, you would want to meet with a doctor, and ask how he would expect to use the website. What his workflows are and what’s important to him. From there you can maybe build a wireframe, or improve on an existing one, since you have a better understanding of what he was wants to do, and how he wants to do it.
I guess the more you learn about behaviour and customers mindset, the more you can improve on UX.