Is there any form of task manager or device monitor?

Is there some way i can examine the resources that the computer is using (e.g. ram/cpu/disk usage) in one place with a gui?

Please have a look here: https://wiki.archlinux.org/title/Applications#System
Hopefully you’ll find something to your liking.

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several. If you use KDE, there is plasma-systemmonitor and ksysguard

Cheers!

You are in luck because there are probably literally a thousand options to choose from. The list from @pebcak’s post was great, and a great place to start, but is also a drop in the bucket.

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What DE did you pick? It probably already comes with one.