Install Arch Linux

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I have installed Arch Linux ISO on USB. And In BIOS I did not disable
security boot, because I thought it is not good idea. I have started to
find decisions to my problem, and most popular answer was disable security
boot. If I disable my security boot, it will be safe for my PC? Maybe do
you have any other decisions? And why my PC require it for Arch Linux but
for Debian not?