Users can connect many smart devices with their Alexa Amazon App and Echo. For example thermostats, smart lights, cameras connected to Alexa, Robot vacuums. Alexa App will control all these devices like a home automation system. You just have to give a voice command only to Alexa for performing such tasks.
Echo skills are added into the echo devices automatically.It adds to the device by Amazon's server. Open your Amazon Alexa Login by inserting username and password. Then add skills by clicking on the right menu in Alexa Amazon App.