UI/UX designers' job is to create user-friendly interfaces that help users understand complex technical products. In simple words, the main job of a UI designer is to see how the product has to appear to the user, whereas the UX designer's job is to ensure that the user is able to easily use the product.
If you want to learn all the required skills for UI/UX design, then take up this UI UX Certification from a recognized institute like Intellipaat.
Do check out this UI/UX design training video for more information -