The best measure of one’s expertise in a field is not what one knows, but what one is aware they don’t know. As a person climbs up the ramp to proficiency in a skill, the amount of visible depth of complexity explodes in their face, forcing them to confront how much there is to learn. I am just at the beginning of my path into the realm of bicycle maintenance and repair.
With that said, I do have some impressions regarding brands that have held up to my experience thus far. There are a LOT of bike brands, and I will only cover those that I have been working with often here. You will also not find many specifics, mostly because I still don’t have too much of a clue. Consider that my disclaimer.