Flipkart vs Amazon, which should I pick first if I can only do one?

There's no universal answer, Flipkart's zero-commission tier under ₹1,000 and deeper Tier 2/3 penetration make it strong for fashion, home and value-priced categories, while Amazon skews toward urban premium buyers and has the stronger advertising and Brand Registry ecosystem. Directionally, Amazon's all-in seller costs run somewhat lower than Flipkart's on a like-for-like sale once you stack commission, fixed fees, collection and shipping, but this shifts by category and changes often, so model your own numbers rather than trusting a blog's percentages. Most scaled sellers end up running both within a year or two anyway, so pick based on where your category's buyers already are, not on fee percentages alone.