What should I know before downloading steam as to a flash drive.?

I am pretty decent when it comes to basic computer stuff... The thing is I tried to do some hardware stuff and sucked at it so badly that I lost a hard drive. But they say ever bad experience has a silver lining, so I want to download steam OS onto my old computer. Besides being on Linux.What should I know about both stems and Linux before I do this.

p.s. I am an amuture at making new p.c.s

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