Airdragonz

Haven't built in the case personally so not sure if it'll work, but make sure the top can still support a 360mm rad if you got a 420mm in the front+25mm for fans. Tubing is fine, just get fittings that fit. Pure distilled water without any biocide worked fine for me back when I watercooled, but I also did clean my loop once every few months. Having cpu after gpu will have a nearly immeasurable effect as water is moving too fast for the gpu to cause a hotter cpu temp. Also add a drain valve towards the bottom of your loop - makes life a lot easier.

In theory, yes adding a metal piece there will result in better internal case temps but not by much at all, unless you intend on adding a fan or have sufficient airflow over the top of the metal piece. This will also work better the greater the difference in temperature there is between the metal sheet and the ambient room temperature (greater temperature delta means better passive cooling). Do this for the aesthetic purpose, but don't count on it dropping temps by any meaningful amount.

Your best bet will be to check out your local PC component store (US examples might be microcenter, best buy, etc) and ask around every couple days to see if there's any stock. It's a lot harder snagging one online.

Currently use ProtonVPN. They have a free tier without data caps, albeit slower speeds and limited servers. Or pay for a monthly subscription for access to all servers. Been reliable so far for me.

If you want to get the most amount of money while selling as much and as fast as possible, sell parts in bundles. For example, sell cpu+cooler+mobo together. Ram, gpu, ssd, psu, can all be separate with small discounts to a buyer who buys multiple parts together. Look into r/hardwareswap if you need some inspiration on how to bundle parts together.

Most intensive animation and rendering will typically require a powerful gpu, although a powerful cpu can also be competitive in some applications (such as blender). If you're looking for something with good performance per dollar that's better than your Inspiron, Apple's M1 mac mini looks pretty good for the money right now. Or if your current laptop supports egpu's, you can go that route.

"Best" is pretty subjective and very much money dependent. What's your budget? Are you looking for active or passive speakers?

Task manager will report the clock speed of the single fastest core. A 3700x has a max single core boost clock of 4.4ghz. The videos you are seeing refer to an all core overclock in which every core will be clocked to 4.3ghz. You will therefore lose some performance in single threaded tasks, but gain a bit more performance back in multi-threaded tasks by overclocking.

Use either asus's fan control software or motherboard bios settings to set a quieter fan curve

A 5900x would likely be the better of the two. 12c/24t is more than enough for a game and streaming, especially considering that most games do not take advantage of anything more than 16 threads. Higher IPC and a more mature 7nm process is also a win for the 5900x over a 3950x.

Check your bios settings to make sure your motherboard isn't cutting power to the usb ports when the pc is asleep.

I've used an anti static bag wrapped inside a ton of bubble wrap and that worked fine. Better be safe than sorry with packaging. If possible, I'd also recommend insuring the shipment.

Any reason why you aren't considering Google's Nest hub? I believe that's on sale for $49 USD currently and pretty much better than the lenovo in every way. With that aside, also check that all your smart lights/devices can be controlled by either alexa or google assistant. Some lights only work on just alexa or just google. If everything's compatible, it'll really come down to personal preference as both can pretty much do the same thing (such as setting multiple alarms).

GTS will perform the best, at least at lower rpms

Enable XMP or DOCP profile in bios