When to use it
Use it when you're stuck on a task or a process. Say what you do understand, then name the exact point where you're stuck. It shows you've made progress and lets the other person help with the right piece instead of starting over.
Example
You: “I understand the goal. Where I'm stuck is the budget step: I'm not sure which cost center to use.”
Manager: “Use marketing ops. I'll send you the code.”
In an email or Slack message
In a message: “I'm clear on the goal and steps 1–3. I'm stuck on step 4 (budget): which cost center should this go under?” Numbered steps make your question precise.