How to create a UX/UI logo?

Knowing what your clients want, and what user research has presented. This as far as color, mission, and vision all play a huge role. You will always benefit from the low fidelity sketches, and reiterating to a high fidelity, backed with design choices. There are few universal laws that graphic designers play to for what it requires, how unique it is, and what makes the logo successful. Always learn from other designers, and how they accomplished their goals for the long and short term of representing the brand, and all guidelines to its identity.