I also came from a debian based distro. This forum is a wealth of information.
I assume you already ran it as a live boot first?
I ran Garuda-Linux in a Clevo laptop and my LED Keyboard did not lightup. In my case, I used what my previous distro used: tuxedo-keyboard. I installed it from Octopi and never had an issue since.
Some Tips:
Use the search tool in here. In the odd chance you cannot find what you are looking for, just google : Garuda Linux (insert issue here).
When asking for help, be as specific as possible with any errors, warnings, specific packages, etc.
Check if your packages is up to date. Partial upgrades are a no no.
Before upgrading or even installing any new packages apps, I personally check in here for any known issues. I also check the build status of the AUR.
Remember it is a rolling-release. there may or maybe not glitches from time to time. Though in my experience, extremely minor and the fixes were within a 24 hour time span (Again my personal experience so far).
Always post your garuda.inxi after your request for help post.
I really enjoy this forum and there is a section that walks you through how to post. Not complicated at all.
As for items missing in live install: in my case, there was no difference and I was able to easily find any thurd party drivers I required.
If you use a NVIDIA be sure to search for that in here before the upgrade as there are helpful posts and articles regarding any of those issues. Same with Bluetooth and Network drivers/issues.
So a warm welcome and when you have time, post your garuda-inxi with specifics about what’s missing and we’ll do our best to help, 