Help to upgrade

good day need to renew a bike canyon grand canyon all 3.9 2016, would it be shimano slx m7100 1x12? https://www.bike-discount.de/en/warenkorb/detail
and the bottom bracket is not clear to me
little know about bikes i would like advice
and the bottom bracket is not clear to me
little know about bikes i would like advice
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I know this has not helped with the upgrade advice but it’s a start.
Aside from not knowing what BB you currently have, you may also need to consider if your freehub is compatible. The Shimano 12-speed cassette uses a microspline freehub. Sram NX Eagle cassette uses a standard shimano freehub so could be a direct replacement for your current cassette. The Sram GX Eagle cassette and above uses an XD freehub.
FRAME CANYON GRAND CANYON AL
FORK ROCKSHOX XC 30
REAR DERAILLEUR SHIMANO DEORE SHADOW 9S
DERAILLEUR HANGER DERAILLEUR HANGER NO. 30
FRONT DERAILLEUR SHIMANO ALIVIO 9S
SHIFTERS SHIMANO ALIVIO 9S
BRAKES SHIMANO BR-M355
HUBS SHIMANO RM35
CASSETTE SHIMANO ALIVIO 9S
RIMS ALEX MD21
CRANKS SHIMANO ALIVIO 9S
CHAINRINGS 40-30-22
CHAIN KMC X9-93
BOTTOM BRACKET SHIMANO BSA
STEM IRIDIUM 3-0
HANDLEBAR IRIDIUM 3-0 FLATBAR
https://www.bike-components.de/en/Shimano/SLX-M7000-1x11-32-Groupset-p65605/
Then buy any Shimano Hollowtech II BSA 68/73 threaded external bottom bracket which will work with your bike.
As already stated the 1x12 option you linked will need a new rear wheel/hub with a Microspline freehub for the cassette to fit to.
Your freehub doesn't have a max of 10 and will fit Shimano 11 speed cassettes, most other 11 and 12 speed cassettes just not the one you linked!
Also think it's a great idea to take previous good advice, buy this upgrade, new bottom bracket and take them to a local bike shop to fit for you, seeing as you 'little know about bikes'.
I pointed out that for the 12 speed cassette you would need either a new wheel or hub (wheel/hub) with a Microspline fitted or that can be retrofitted with one as the Shimano hub you have now can't be fitted with a Microspline freehub.
One option is to buy a hub with a Microspline freehub already fitted then pay someone to remove the old hub and totally rebuild your wheel around the new hub. This will cost around £150-£200 I would estimate.
Another option is to buy a new wheel that is ready to go with the suitable hub and freehub already fitted which will cost around £150-£200 too.
But hay, it's your money and maybe it's worth it to you to have a 12 speed instead of 11 on a bike that's worth a lot less than the upgraded groupset you plan to fit to it.
SHIMANO SLX - Rear FREEHUB - MICRO SPLINE - CENTER LOCK - Disc Brake - 157x12 mm E-THRU Axle - 12-speed
Compatible with 12-speed MICRO SPLINE cassettes.
Faster acceleration amplifies riding excitement
Smaller spline diameter for 10T top gear by MICRO SPLINE
Simple setup and reliable trail performance
Easy disc brake rotor installation with spline mount and lock ring
CENTER LOCK
12 mm E-THRU axle
Stiffer rear wheel option
Extra wide O.L.D. spec: 157 mm
here are three choices here one of them
with detail and spoke changes will not cost me more than 100eu
just wondering how about the brake disc or the old one will still fit?
https://www.bike-discount.de/en/buy/shimano-slx-1x11-speed-m7000-group-11-46-without-disc-brakes-671490
This hub won't fit your bike, not even close!😭😭😭
Highly recommended you go to a local bike shop and discuss your options with them as ed1973 said in the first place.