(Noob Question) Why should I use SASS?

I've been doing some pretty beginner CSS for a couple of months now, and thought I'd hit up SASS. I installed Ruby, and then installed the SASS gem. I began using SASS, and eventually ended up asking myself why I'm even using SASS when I can write CSS much faster. Is it a combination of using SASS in specific situations and my inexperience with SASS? I really like how you can use for-loops to quickly address multiple id's and classes. With this though, if you're having to address possibly hundreds of classes with their names only differing in a number, isn't your DOM addressing just poor? Idk, can someone give me some good reasons and situations for using SASS?

Thanks

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