If i buy for example a lutron devices that need a hub, does i need to buy that hub to conect to home Assistant or i can connect it directly to the Home assistant hub
To control devices through home assistant directly you need either a bluetooth, zigbee or z-wave adapter to plug into the device hosting the install. From there you just install the plug in either via Home Assistant Community Store or native through Home Assistant based on what is supported.
You then start the paring process and go from there to setup your dashboards and automations for your needs.