Today I learned the difference between different light bulb colour temperatures by buying the wrong kind. Turns out that "warm/soft white" is more yellowy and is best for bedrooms and living rooms, while "daylight" is blue-white and is beter for offices and garages.
It's better to make a mistake once and remember it forever than to get it right the first time and never know why.
i was today years old when i learned this. good to know!