Yes, I had the same questions when I started selling there. Commissions can be quite difficult to calculate manually — there is a listing fee, a final value fee, and a PayPal fee if you use it. I found a tool that automatically does all the calculations for you. Just enter the price and category of the item, and it will show you exactly how much you will pay and how much you will receive. It really saved me from unpleasant surprises. I mean this eBay commission fee calculator for Canada
https://easync.io/ebay-fees-calculator/ca/