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I am asking the same question from before by other people. My Macbook Air cannot connect to LAN internet. At the network preferences tab, it showed that my USB LAN has a self-assigned IP address and will not be able to connect to the internet. The network status showed 'CONNECTED' but below, it mentioned about the self-assigned IP address. What is it about?

I tried to look for a solution via google but I check my system preferences that my Macbook Air does not have this folder called 'library' where I could delete some of the un-used file or un-wanted file from my Mac. How can I solve this because I really need to use the internet when I have to pay the internet bill every month for my student residence. I have asked my friend from the residence but they also don't know how to deal with it.

Is my Mac is not the original Macbook that does not have such a folder?

I am just worried. I am sorry that I am not a tech-savvy person.

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  • It's unclear what you are asking about. Generally speaking, unless you know exactly what you are doing, you do not want to be messing around in the Library folders as you can break macOS on your Mac. Could you clarify how your situation relates to a self-assigned IP address? If you are in a student residence, you may be able to get help from your school's IT help desk concerning your issues. Also, you mentioned others have asked this question before. Could you link us to other AskDifferent articles that directly relate to your issue?
    – drivec
    Sep 18 '19 at 14:45
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Your title does not seem to have anything to do with your actual question, you should change that.

There are a number of "Library" folders on your Mac, but the only one you should ever go into is actually hidden, meaning that Apple (for all intents and purposes) recommends you stay out of it.

Why? Because deleting things in your users Library folder without knowing what these files do could cause more than a few things on your Mac to stop working.

If you just need to do some clean-up and delete unneeded files I recommend using a utility like Onyx (I use it, there are others that do similar things). And that will clean up the unneeded (cache and temporary) files for you, safely and easily.

If you want to go exploring though you can view your Library folder by holding the Option key down while selecting the Finder's "Go" menu. "Library" will show up in the list and then all you have to do is select it to open a Finder window to explore.

But, again, be careful deleting things. If you do not know EXACTLY what a file is or does leave it alone or you could cause problems with your Mac, one or more of your Apps or numerous other things could stop working.

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Simply press CommandShift . . to see the hidden folder, your Library is there under your user folder.

I suggest you read the proper site who is suggesting you delete the files of Library. It is good and helps to fix after deleting but it might hamper your macOS too.

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  • I tried to do that, but it does not appear. I don't know if my laptop is just simple or it is me, myself did not finish explore my computer.
    – Sitie
    Sep 18 '19 at 15:11
  • Go to Finder -> Preferences -> Under General tab, check Harddisk to show in Desktop. Double click the HD and you will see different folders from Application to Library. You can double click Users folder, be on your name and once you are there, press the three key combinations that I suggested. It is Mac and it can't be different from other one.
    – Udhy
    Sep 19 '19 at 11:49

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