If you're going to work on reducing your cart abandonment rate, then it's important to understand some of the reasons that people abandon their carts.
A study by Statista on US consumers has shown that the most common reasons to abandon a cart include expensive shipping, they were just browsing or researching and not looking to buy, there was no free shipping, the customer was unaware of shipping costs, the shipping is slow, there's a long process to check out, or there is bad site navigation.