I am an Indian passport holder, can I travel to Canada on an ETA visa?
You cant. The eTA is not a visa. It is an electronic travel authorization given to people form visa-exempt countries to visit Canada. People who do not need a travel visa to visit Canada. You are from India, which is not visa-exempt so you need a travel visa to enter Canada. eTA and a travel visa are two different things. So unless you have a passport form a visa-exempt country you nee to apply for a visa to visit Canada.