You should have a valid purpose to visit Canada
>> You cannot say for tourism purposes if you haven't stepped out of your home country.
You should have strong ties to your home country. Reasons why you will go back, such as a job, family, properties and assets.
You should be financially capable to travel.
>> Means money for the trip. If your money is not enough and will just burn your savings the visa officer will just think that the trip is just an expense. Hence, will reject your application.
