I'm a non-professional digital artist, Drawing with a mouse is not a fun experience, and much harder to learn than drawing on a tablet.

I'm looking for a pen display tablet ( I can draw on the display ) that can also be used for drawing and animating (something like adobe flash, simple animations). I would like it to be pressure sensitive. I remember a friend showed me his drawing tablet monitor XP-Pen Artist 12 ( Oh, and here the tablet itself: www.amazon.com/XP-PEN-Artist12-Battry-Free-Multi-Function-Sensitivity/dp/B07GNK18VJ ) and the pressure sensitivity thing was amazing to me.Do you guys know any?

I will also get one of those Stylus pens, so the important thing is that the tablet has an animation program! the tablet should work well in drawing software like Paint Tool SAI, Clip Studio Paint, Firealpaca/Krita (both free!),and Photoshop of course (although this may require external tools like Lazy Nezumi) .
I want a Device that isn't huge , I work on Windows 10, High Specs pc. My Budget is somewhere around 300-500$ can go above it if it's really worth it. Total noob so would appreciate some friendly advice .

Samsung Galaxy Tab S3 comes with a battery free stylus with hover and pressure sensitivity and palm recognition.

My advice (as a professional), dont waste money on a tablet with a display (assuming you're talking about something like a cintiq, and not an android tablet).

Get a WACOM Intuos Draw / S (under $100 usually). Learn from there.

https://www.wacom.com/en-us/products/pen-tablets/wacom-intuos

Why not get the big flashy screen display tablet? - You're a noob by your own admission, and you wouldn't give a learner driver a formula one car.

If you want a monitor tablet, Huion is way cheaper than Wacom.

You mentioned animation. The latest version of Krita has pretty good animation features!

In addition to what Sachys said:

A drawing tablet feels odd at first and definitely takes some time to get used to, but it quickly becomes like second nature. I really don't miss having a screen.

I've also heard a lot of not-so-great things about cheaper brand tablets (with and without screens), from breaking quickly, to a lack of precision or sub par built in screens to bad driver support.

There are some good ones for sure (Huion being one of the better ones), but all the Wacom tablets I've seen where built like tanks and well worth their price.

Id suggest a Intuos as well, maybe the M sized one, less scrolling and zooming that way.

https://www.youtube.com/watch?v=Sa_qfw6JYq4 (Huion Kamvas Pro 13 Review)
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20181006092120&SearchText=Huion+Kamvas+Pro+13

Get the KAMVAS PRO 13 with the 5% OFF discount code (sponsored): KAMVAS13
(Offer ends 31 October 2018)

Edit: https://www.huion.com/pen_display/Kamvas_Pro_13.html
Supports: PS, AI, Painter, SAI, Gimp, Clip Studio and Krita.

rubberross does amazing drawing and animating, if u need help im sure he can answer u in his spare time as he works with companys

i was thinking cintiq but seems like other might have better option here

Hmm... I have old Wacom Intuos 3 A5 but I always wanted something "with a screen" to draw on.
That Kamvas, it seems, has also a little bigger "piece of paper" so that's a plus.

But I'm wondering - would it be worth for me to change in terms of quality?
I've never heard about this Huion company earlier...

You know what they say: "size doesn't matter - it's what you do with it, that counts" ;)

A little more serious, though:
Jazza addresses that at 6:55 in the linked video - https://youtu.be/Sa_qfw6JYq4?t=415

Or...if you really need something bigger (and you are willing to pay ~100 to 400 bucks more) have a look at this:
https://www.youtube.com/watch?v=VgSypwid5ck (Huion Kamvas GT-191 Unboxing & Review)
https://www.youtube.com/watch?v=1bAx9rugXsE (Huion GT-220 v2 - IPS Pen Display)
https://www.youtube.com/watch?v=NS9rxMPshvk (Huion GT-221 PRO: Digital Tablet Review) Huion is an upcoming force in the "drawing tablet industry", and definitely someone to reckon with...
I've seen a few videos of professional artists testing their stuff, and they all were impressed by
a) the quality and
b) the price-performance ratio.

Apart from that: https://youtu.be/Sa_qfw6JYq4?t=793

Edit:
Quote: "My recent experiences with the latest Huion devices have solidified my feeling, that Huion are the
fastest innovators and highest value providers for digital artists today. And I can't stress that enough: they're constantly bringing new things to the table for the value that you're spending to get their products. They're really great quality, well designed and constantly pushing the envelope of what is accessable to artists today. So I can't recommend them enough."

Do you know what's their policy on, so called, "bad pixels"? I can't find this mentioned anywhere.

No, sorry...all I can say is that none of the people I've seen testing their tablets had any problems with bad pixels.
Not that that necessarily means much, of course.

Why don't you just look up some (customer-) reviews, etc.,...?

Well, I was trying, but, as I said, can't find this thing mentioned anywhere. :(

Could be a good sign?
I mean - if their tablets would be prone to bad pixels, it surely would be mentioned in (customer-) reviews.

Think positive. ;)

Edit: https://www.huion.com/contact/
Try asking them, how they handle bad pixels?

Good sign? Definitely yes, but I would still treat such tablet as "another monitor" and I know I would "hate it" if some "dead pixel" appears during my use. :D I'm not talking here about noticing such defect "just after unboxing" but if it appears after a month or so (and such things can happen on monitor panels).

There are computer standards which describes class of monitor panels, but I'm really not sure how this works in the world of display tablets and, if it does then what class is in this Huion's product.

I'll try for sure at some point.

For now it is just a little "weird" for me, that nobody in these "highly positive reviews" mentions about this kind of "important" detail because, as everyone knows, "bad things" can happen and in case of device with display panel this could be one of them.