What are the must do/have things/apps for efficient selling on amazon/eBay/marketplaces?

Hello PH, I’m about to start selling items on marketplaces. So I would like to have some advice, recommendations and tips on the best tools to use to get maximized results (at a lower cost). I was told about SellerMania for example.
Félipé UpperlifeFounder @ Upperlife · Asked

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