Differences between these Settings

Hi guys. I’m having a really hard time differentiating these three settings from Mi phone:

Note: "icon" here referred to the settings entry icon at the upper right corner of certain apps

1. Lock Apps(@Security\Boost speed\"icon"),
2. App battery saver(@Security\Battery\"icon"),
3. Battery optimization(Settings\Privacy protection\Special permissions).

What are the differences between these 3 settings? Why would a phone have 3 settings with seemingly similar purpose? I believe there’s a different job for each, but i don’t know how they differ. A explaination/clarification would be much appreciated. Thanks in advance

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