This morning, I was working on what to keep, and what to get rid of.

I will keep what I'm going to read in a month.
I'm going to read CCNA certificate guide books for reference, although I got them 6 years ago and already obsolete. It's still useful to review basic network technologies and basic features of Cisco products.

I will get rid of what I haven't been read in 5 years and I won't read again in a year again.

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