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I am following the full stack blockchain development course by Patrick Collins & it's freely available on freecodecamp.org's YouTube channel. You can find the course on the link shared below, https://youtu.be/gyMwXuJrbJQ?si=nkPrFgJCy8Gw7t6_ In addition to this, you can always go through official documentation of Ethereum, Hardhat & Solidity to know more insights