High ram usage when idle

[kabir lakhani]

I have a 8 gb ram laptop. When i close all the programs via task manager, the memory usage is still about 3-4 gb. How do i reduce this? I have tried everything as told in the following youtube video-

View: https://www.youtube.com/watch?v=osKnDbHibig
Also, the memory in processes tab in task manager is more than it is shown in the users tab?

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