A reusable Geometry Nodes group should remain understandable after the day it was built. Clear controls help both its creator and other users.
Define the task first. Expose the parameters somebody genuinely needs rather than every internal coefficient.
Name inputs by their effect: width, density or tilt. Give them sensible defaults and ranges. A separate Seed makes randomized results repeatable.
Use frames and groups to distinguish preparation, distribution, deformation and material assignment. Organize connections so that they explain the sequence.
Try minimum and maximum settings, zero elements and different source scales. Testing those cases early makes the tool easier to reuse in real scenes.