When to use fix or repair?

Good afternoon, could you please clarify for me when it's appropriate to use the term "fix" and when it's more suitable to employ the word "repair"? I'm trying to get a better grasp on the nuances between the two, especially in the context of cryptocurrency and financial services. Is there a general rule of thumb, or does it depend on the specific situation or industry jargon? I'd appreciate your insights on this matter.