How do you play coin master?

I'm curious, how do you actually play Coin Master? I've heard it's quite popular, but I'm not quite sure how the game works. Do you need to strategize or is it more of a luck-based game? What kind of skills do you need to be successful? Do you have to spend real money to progress or is it possible to win without investing? I'm intrigued by the concept but want to understand the mechanics behind it before diving in. Could you explain the basics of the game to me?