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，推荐阅读heLLoword翻译官方下载获取更多信息
11) Can i mint NFT for free?To mint an NFT token, you must pay some amount of gas fee to process the transaction on the Etherum blockchain, but you can mint your NFT on a different blockchain called Polygon to avoid paying gas fees. This option is available on OpenSea and this simply denotes that your NFT will only be able to trade using Polygon's blockchain and not Etherum's blockchain. Mintable allows you to mint NFTs for free without paying any gas fees.。关于这个话题，旺商聊官方下载提供了深入分析
chapter on mastering the eshell (which happens to be free).