You have a problem and you need to describe it in a way that Other People can solve it in a way that satisfies what you want and need.
"Build me a spaced repetition web app using FSRS" will give you _something_, the statistical average to be exact, but most likely it's not what you meant or wanted.
You need to make the implicit things in your head explicit and write them down. AND then you need to split that into manageable chunks of work that build on top of each other.
It's a skill.