File1:

Unix is a computer Operating System which is capable of handling activities
from multiple users at the same time. The development of Unix started
around 1969 at AT&T; Bell Labs by Ken Thompson and Dennis Ritchie. This
tutorial gives a very good understanding of Unix.
PuTTY is helpful for learning Linux command line.
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File2:

A solid-state drive (SSD) is a solid-state storage device that uses
integrated circuit assemblies as memory to store data persistently. It is
also sometimes called solid-state disk,[1] although SSDs do not have
physical disks. SSDs may use traditional hard disk drive (HDD) form-factors
and protocols such as SATA and SAS, greatly simplifying usage of SSDs in
computers.[2] Following the initial acceptance of SSDs with HDD interfaces,
new form factors such as the M.2 form factor, and new I/O protocols such as
NVM Express have been developed to address specific requirements of the
flash memory technology used in SSDs.

File3:

Begin the news with a buffer that establishes or maintains rapport.
Use an “indirect approach”: build up to the bad news with the reasons for the negative outcome.   (100)
Avoid words that have negative connotations, for example, refuse, deny, can’t, unfortunately, and so on, because your reader will “key in on” these resonances, which could negatively impact their attitudes toward you and your message. Or these negative resonances might make them anxious, which could impede their ability to understand your message.   (356)
Embed the bad news within the positive elements, such as the center of paragraphs or middle of sentences. Emphasize the good news by starting and ending with it and giving more space to good news than bad.   (206)

3 lines are longer than 80 characters!