Dell XPS 13 9350 skylake/2016 question about NVMe SSD..

hello, this is my first post on these web forums, I hope I'm posting this in the right place and also am hoping to get some answers/help !

I own the Dell XPS-13 9350, specs are as follows:

Dell XPS-13

color is silver;

16GB Ram/Internal Memory

512GB SSD NVMe THNSN5512GPUK NV

QHD+ Infinity Edge Display (with touch-screen)

Intel Core i7-6560U Processor

Intel Iris 540 Graphics

I've owned this computer since March of this year, and I am still fairly new to it and its usage. I am in the beginning of my journey into the computer/laptop world of understanding, rebuilding, and upgrading, and there are a few things I would like some help with to better understand myself about this device, and I hope someone can help me out with these questions so that I might better understand what I am not only doing, but dealing with!

now I have the 512GB SSD with this XPS 13, I have been trying to determine which SSD I have as I've read online that there are many different models and makes, and some of which work faster when it comes to read/write speeds (I'm not even sure exactly what that refers to yet, like transferring data from USB drives to and from my laptop when something's plugged in? faster load times for apps and games? idk) - but the only thing I can find through system settings and device manager are:

in device manager - under "disk drives", I've found this - THNSN5512GPUK NV. Does this indicate what brand of SSD I have? I know there is a huge debate over Samsung, Toshiba, and one other company who manufacture these SSD's and some work better at read/write speeds than others. I am trying to determine which brand I have, and if its a good one - or if I should upgrade that (something I am willing to do down the road if I find useful)

another thing is, I don't know which drivers I need to update, and for what reasons, I've tried visiting dells support website to auto-detect, but am having some fairly small issues with that, I'm afraid I may have already installed some driver updates and its still saying I can update them again, is that safe to do? I keep receiving a notification saying I need to update my intel graphics driver, when I have already upgraded that driver online, it keeps popping up like 9-10 times a day, how can I fix this and how can I determine which drivers I need to update? my battery life seems shorter then specified, I fully charge the laptop, and let it drain all the way down before I recharge, and I always unplug when fully charged, I wont let it sit plugged in over night and I always shut my laptop down when I'm done using it, still I seem to only get a portion of what I read I am supposed to get in the battery icon/indicator in the task bar (i.e.= right now I'm at a 72% charge, and it says I have 4 hours 34 minutes remaining) yet I only get a portion of that battery time when all I am doing is web surfing, and occasional(sometimes more than occasional, like the whole time I'm on YouTube but in-between I google something, but nothing else) - I keep my screen brightness relatively low, usually between 25-30% - I read somewhere online I should be getting like 7-8 hours at 75% brightness when all I'm doing is web surfing and YouTube, but it seems like I'm getting a whole *** of a lot less, maybe I'm wrong somewhere here, I'm not 100% sure but it just feels like something doesn't add up for me. I am not on the FHD 1080p version of this laptop, and I understand that the QHD+ (near 4K?) version gets less battery life, but is it supposed to be as what I've described here?

I Appreciate your time in reading this, and whomever reply's to this I really do appreciate your help and advice, thank you guys so very much in advance! looking forward to hearing back from you guys!