[Help} W: Target Sources is configured multiple times in etc/apt/sources

So recently I got a new handed down laptop (Dell Latitude E6430) as my old one was not cutting it for what i needed. I took my old HDD with debian 10 buster out of my other laptop and placed it into this one.

My wifi wasn't working and i was about to reformat and try over when i noticed it said I needed a non-free firmware b43/ucode_mimo.fw

So after a bit of googling, I added nonfree sources
that it said i needed and ran

Code:sudo apt updateUpon completion I was met with:

Code:W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:11
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-i386) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:2 and /etc/apt/sources.list:11
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-i386) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10
W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list:1 and /etc/apt/sources.list:10I get that its saying there are duplicates but are "Main" and "nonfree" main the same?
and if so, why are they even differentiated between if that makes sense?

Once I added these non free I was able to get what i needed which was:
Code:sudo apt-get install firmware-b43-installer

My sources:

Code:deb http://deb.debian.org/debian buster main
deb-src http://deb.debian.org/debian buster main

deb http://deb.debian.org/debian-security/ buster/updates main
deb-src http://deb.debian.org/debian-security/ buster/updates main

deb http://deb.debian.org/debian buster-updates main
deb-src http://deb.debian.org/debian buster-updates main

deb http://deb.debian.org/debian buster main contrib non-free
deb-src http://deb.debian.org/debian buster main contrib non-free

deb http://deb.debian.org/debian buster-backports main contrib non-free
deb-src http://deb.debian.org/debian buster-backports main contrib non-free

deb https://dl.winehq.org/wine-builds/debian/ buster mainAppreciate all and any of your help.