✓ Accepted Answer
The way this question is framed suggests you might be hitting the same wall most people hit with difference.
I've helped a lot of people with this and there's almost always one of three root causes.
**Most likely culprit:** a misunderstanding of the core requirement. This accounts for roughly 50% of cases I have seen.
**Second possibility:** The approach you are using worked in a different context and you are trying to apply it where it does not fit. difference has specific conditions where it works well and conditions where it falls apart.
**Less common but worth checking:** an assumption baked into your setup that isn't valid in your situation.
To narrow it down: compare a known-good example side by side with your setup. That will tell you which of these you are dealing with.
by bintasow
Let me give you the numbers-first answer on difference, because concrete data cuts through the noise.
**What most people actually need to know:**
- About 77% of difference questions come down to foundational knowledge that takes weeks not months
- The remaining 23% is context-specific and something you will figure out as you go
- 41% of people who struggle with difference are missing basic prerequisite knowledge
**Realistic timeline:**
- Functional competence: 5 weeks
- Comfortable with edge cases: 4 months
- Genuine expertise: 3 years of active use
**What 7 out of 10 resources get wrong:** They focus on the ideal scenario. Real usage is messier and requires adapting to your specific constraints.
Start with the official documentation for difference, get one complete example working end-to-end, then branch out from there.
by edenamare