The Seller's Guide to Ecommerce Success on Amazon, Instacart, Walmart and Target These four major ecommerce platforms require different strategies for success.

The past year has brought a seismic shift to digital commerce. The pace of change has put many consumer brands in reactive mode, ensuring they are set up and advertising across all platforms.

However, approaching each platform individually — and without understanding their nuances — is a grave mistake. A cross-platform strategy is critical to sustainable ecommerce success, and there are several strategies to get there. As these retailers compete aggressively to grab the ecommerce consumer and share of wallet, brand manufacturers are often left in the dust. If brands are feeling lost on the nuances of these ecommerce platforms, they're not alone.

This is what you need to know when engaging with the four major retail and advertising platforms: Amazon, Instacart, Walmart and Target.