What are some good resources to learn about missing values and different approaches to deal with them?

I'm pretty new to my professional job, but from school I know missingness is something we'll never escape. I have survey data my project lead wants me to use, and we can't impute if someone didn't fill out the entire survey. They want me to decide between dropping the survey for the sample entirely vs keeping it in, and I want to learn a bit more about what the options are here. Especially since a concern is that the group …

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