>Is it to reduce the amount of fuel?
Yes, straight path would be incredibly energy efficient to the point that modern rockets just can’t do it. As for why this is so, easiest way to get a grasp on orbital mechanics is to play [Kerbal Space Program](https://store.steampowered.com/app/220200/Kerbal_Space_Program/), it’s a gamified physics sim. A fair bit of fun and a for a game fairly realistic learning experience on just how orbital mechanics works, how to maneuver a spacecraft etc.
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