New laptop

it's NOT your case because you say you just buy it BUT....
The only thing i can say is for OLD things (not new same your,i mean after 2-3 years of use) FAN accumulate DUST that form a sort of CAP and so make the fan be nothing (you could see this also in my twitter or channel i release pics\videos)
and this make gpu fan work at 80% because can't dissipate,the result of all this is +19° Temperature.
So it's important after 2-3 years to remove the dust from the gpu (or device) fan,this then will make temperature go down -19° and make also the gpu can work with 33%\50% fan speed (instead of 80%)

dust:
https://pbs.twimg.com/media/FTFcO6uXEAAZcxY?format=jpg&name=large
difference in temperature:
https://pbs.twimg.com/media/FTFcO6KWYAEm-1G?format=jpg&name=medium

The surface of the laptops is like a magnet for fingerprints, how do you clean yours or any other ideas ?

Use a clean wet microfiber cloth, then a clean dry one.
Then do it again if needed. It is better to be patient than to try to press harder.
You shouldn't need something else than water, unless when your fingers were not clean !
Then use the same product than the one you would have used to wash your fingers : usually mild soap or maybe dish-washing liquid or something like... I never needed anything else than water myself, so your mileage may vary.

Alternative solution : wear gloves 😂

1. Other than following basic 'keep battery between 20 and 80%', there isn't much you can do. Physics can't be defeated. As for plugged AC, normally once notebook's battery is charged to 100% it should stop receiving any more electricity entirely if manufacturer isn't a dumbass.

2. Yes, disabling boost USUALLY negatively impacts performance. But in your case it MAY increase it. Give it a try and see if there is a difference. As to why that's possible, well, once CPU (any, be it PC, notebook or mobile) reaches high temp/power limit, it will throttle and reduce its frequency (and thus its permormance) to keep the temp safe.
   One of the most popular benchmarks for testing purposes is Furmark. You can also use MSI Afterburner and its overlay to keep an eye on CPU and GPU temps, load and frequency.

I would return the laptop and go with a different brand. Dell/Alienware make some of the worst desktop PCs so I expect their laptops to be crap also. Reviews of their desktops always have them overheating during benchmarks so no surprise it's also happening in their laptops.

So without the Turbo boost and the TCC Offset[10] the temps are around 60-70 of the CPU and GPU is around 70 ... i tried the same game Borderlands 3 and there was no difference at all... i think this is good, when i need more CPU power i can turn it back to Enabled.. also it was on Aggressive...
Set the charging to 50 - 80, but still continue to charge..

Just remove the battery and run it with power-cord, if you are mainly using it by the desk. No need to have the battery attached at all.

Laptops are really hot. It's quite normal. Skip all the turbo crap.

Install MSI Afterburner to control GPU fanspeeds.

Alienware are hot by design. They want you to have to buy another one in 2 years tops.
I recommend looking at youtube to find out how to get to your GPU and to repaste if you are willing to void the warranty.
I have had two Alienware laptops and one Dell. Same issues.

I think the problem with buying something Gaming Branded like that is ... this thing is not really made to last be working good after 2-4 years ... they just expect you to buy a new one after the new generations of parts come out .

That might be the case with all laptops nowwadays dunno , but Gaming brand ones especially ...

I recently bought a MSI gaming laptop with built-in non-removable battery. Their little conservation program keeps battery charge between 50-60% charged while plugged in.

Temps of 100°C for CPU is common for laptop CPUs but I still think it's unhealthily high. Undervolting and/or re-pasting the cooler assembly with liquid metal could help. Counterintuitively undervolting can improve performance as it allows CPU and GPU to boost to a higher frequency while running cooler. Unfortunately every company has its own Uefi/Bios and you should change settings only if you know what the setting does to avoid unintentionally bricking the device.

To remove fingerprints I use babysoft moist wipes.

If you have an option to set charging to "AC always connected" or along those lines, do that. And when you want to take it outside, charge it fully only then. Basically battery will deteriorate either way. It has some number of cycles it will work. The number is high, but if you keep it, lets say between 60-80%, you could double the number of cycles. Its just physics. If you use it twice as less, you might increase the longevity twice as well (meaning - you might get lets say 200 cycles when you charge it 20-80% constantly, but might increase it to 400 cycles if you only charge it from 60-70. Those are assumptions but roughly it will be better if you keep the cycles shorter). I have both my work laptop and personal one set to these always charging modes and keep them at 70-80%. Battery life seems ok for both, but its a laptop and it will die either way at some point. Thats why I personally stick with ultrabooks just for work and convenience and leave gaming to home PC

As for heating up - thats just laptop for ya... Buy some beefy cooling pad for it.

My personal one has metallic body so now and then I go over with wet wipes and clean it with dry cloth I have for my glasses (similar cloth comes with Apple products when you buy them - they are really good).

I set it to AC Primarily, but always charging to 100%.. there is also a custom charge which i tried[50-80], but i think its not working, because stays at 59% and not charging till 80%.. about the CPU i can’t decide how to use it.. with the Turbo boost enabled temps goes 95-100, without 60-70 and I tried with both at game(Borderlands 3) and there was no difference at performance.. at the benchmark is a pretty huge difference and it cuts the performance much, but i’m aware if i use it all the time when playing to 100 C temps.. If i use wet wipes at the keyboard is it going to be a problem or just in the surface?

personally i might just toss it in the dumpster and learn from my mistakes.... :(

not for the same one but could help
https://www.youtube.com/watch?v=MxDX4ysgHFc