What questions do they ask during the interview process at Best Buy?

This is very dependent on the role you are applying for. Line level will be based on your ability to preform the role. Higher levels, senior analyst and manager roles, will be about strategic thinking. One question asked of a senior manager was, "how many pizza huts are there in America?" This is about strategic thinking, not just kicking out an answer. Remember it's also about your audience, who is interviewing you. Keep that in mind.

Depends on what role you apply for. Most of the time they are going to ask describe a time you went above and beyond a client. Or how do you keep up with the latest tech, how do you deal with a client who is upset, how do you get the trust of your peers