Step 3: Go Deep, One Component at a Time

Now you have your components: Authentication, Feed, Notifications. What's next? Pick one and go deep.

Let's say you choose the Feed component. Start thinking like an engineer who has to implement it:

"To build a feed, I need:

• Web Server: To serve feed requests from users
• Database: To store the feed data
• Feed Generator: To create the feed content"

Notice what happened? You broke the Feed component into sub-components, each with clear responsibilities.

But here's the critical rule: If you're not sure what a component does, don't draw it.

For example, you might think "Maybe I need an Aggregator?" But if you can't clearly explain what it does, skip it. Better to have fewer, well-defined components than many vague ones.

Pro Tip: When in doubt, remove that part. Clarity beats completeness every time.