Here are some tips to help secure your smart home devices:
Always change the default username and password that came with your device before setting it up. Use a unique, complex combination of letters, numbers, and symbols.
Whenever possible, always connect your smart devices to your home network via a secure connection (e.g. WPA2). This will encrypt the data traveling between your device and your router.
Apply regular firmware updates to ensure your device is running the latest security features from the manufacturer.
Disable any unused feature or services that came with the device.
Be conscious of which devices are connected to your home network.
Research your device and any vendor-supplied apps to understand their security implications.