Yes, you can add products to the cart and do checkout in future. Also, if you are logged in, you can add products from one device and then check out from another device. You can even move cart products to 'Save for later', or add them to your 'Wishlist' menu. 

In case your order value is below Rs. 500, you will have to pay Rs. 40 as freight charges.

During the checkout process, the 'Apply Coupon' button is present on the order summary screen to view available coupons. Coupons can be applicable on order value, or on products in the order cart.

You can add/edit/delete your billing and shipping addresses from My Addresses' menu option