I'm going to be taking the Harvs Air PPL online ground school and wanted to know from those who have taken it or from others that have the PPL license. What books and materials are absolutely necessary in getting? I've watched the demo video material and it seems quite thorough and is easy for me to...

Does anyone have any opinions on Sporty's course and if it's useful for a learning Canadian pilot? Are there any other materials that should be studied?

Thanks for any info