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I cannot recommend "Crucial Conversations" enough (https://www.amazon.com/Crucial-Conversations-Third-Talking-Stakes/dp/B09MV3818X https://www.amazon.com/Crucial-Conversations-Third-Talking-S...), excellent source for everyone but esp. for managers. It will teach you how to broach difficult topics with reports and how to deal with difficult personalities, which inevitably you will encounter.