Start with something you can see
A button, a sensor reading or a small light gives you a clear connection between an input and an output. You can learn about state and timing before connecting the project to anything consequential. The first useful result may simply be a display that tells you what the software thinks is happening.
Useful, silly and easier to use
A shortcut can make an everyday task easier for someone. A door sound effect can exist because it makes you laugh. Both can teach you to handle repeated events, missing readings and an off switch. You do not need to claim a time saving to explain why you wanted to make the project.
Bring the awkward detail
The home automation guide covers ordinary failure cases alongside project ideas. Callum’s door experiment gives you another starting point. If you share a build, explain what another household member needs to know and how the ordinary controls behave when the automation is unavailable.