I used to paste a screenshot and hope. Doing these six things first answers the question about half the time, and when it does not, the post gets an answer within the hour instead of three clarifying questions.
Workflow
Copied 3 times
1. Write the one sentence: "When I [action], I expect [x], I get [y]."
2. Find the smallest screen that still shows it. Drop the rest of the steps.
3. Copy the full error from the terminal or the browser console, not the red box in the UI.
4. Check whether it also happens signed out, in a private window, and on a fresh row.
5. Note the last thing that worked and what you changed after it.
6. Post that. Step 2 or step 4 often answers it before anyone replies.
AskVibe