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Hello @menak and welcome! You can get more information by visiting the @spinvest account - it has several posts outlining what the project is about, how to purchase SPI, and how to join the club. This post is a good place to start:

https://steemit.com/spinvest/@spinvest/steempower-investments-official-partnership-agreement-and-the-formation-of-the-steempower-investment-club