1-getting-started-lessons: 1 Readme. Fixed some typos, grammatical and punctuation mistakes.

[GintasS]

Not much to add, ran a few tools and found some mistakes, like PowerShell and so on.

[ghost]

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[jlooper]

There's a mix of correct and incorrect changes here.
Sketchnote can remain one word.
Low-level/high-level can be hyphenated.
PowerShell should be spelled as per your change
The addition of the commas is not necessary.

I'd prefer to not have too many of these small changes, so please be sparing of edits