I am buying a new laptop for photo editing and graphics designing. And, am going to use the latest version of Krita software for it. So, what's the recommended system requirements for Krita 4.2.9. I have a budget of around $1200 and am also going use some high-end software also along with Krita. And yes, I am interested in Windows laptop only. I have even checked for some best windows laptops here and am interested in dell xps 15 and razer blade 15. Any recommendations will be helpful. Thanks.

The official download site has the following to say about sytem requirements:
Operating System:Windows 8.1 or Higher, OSX 10.12, Linux
RAM:Recommended 4GB or higher
Optional GPU:OpenGL 3.0 or higher
Graphics Tablet Supported:Wacom, Huion, Yiyinova, Surface Pro

The laptops you mention are both more than good enough to run krita.

It does look like the low-end Razer Blade 15 is just within your budget and its specifications are notably better than the Dell XPS 15 at your price level.
It also has built in GeForce graphics which may be a deciding factor for you for other software you intend to install.

If you decide on the Dell XPS 15 then I'd suggest the one with the i7-9750H because a more powerful CPU is generally better for everything. The disadvantage of that one is that it has a 256GB storage drive and not the 512GB drive of the lower CPU spec one. They are very fast drives though. (You may be able to get a different drive size option by shopping around and you can always offload/archive storage to an external hard drive that you can buy later.)

In both cases, after-sales support in case of hardware problems is important but I've no idea how Razer and Dell compare for that.

These days, we really should update the memory requirements. Not because Krita uses so much more memory than years ago, but because everyone is making bigger images. I wouldn't buy a laptop with less than 8gb of memory myself, and unless the memory is user-upgradable, 16gb.

Krita tends to need a lot of resources to get going, with the advantage of scaling very well to much more powerful hardware, and every major part in a system can become a bottleneck.
You need lots of RAM, a good amount of video RAM(probably 3:1~4:1 ratio?), a fast CPU(lots of cores), and a fast GPU. It's hard to scale all of these at the same time in an affordable laptop. Video memory bandwidth is important as well.

Most other illustration software, there's really just one or two specs to watch, like Clip Studio only cares about your L3 cache size, and maybe core architecture and frequency, basically; it won't scale to GPU or multicore well at all, gives 0 **** about vram over 1GB, and also handles RAM very efficiently even with larger canvases. The tradeoff is you just stop scaling in performance as soon as you run out of L3 cache. It's just a hard cutoff for brush size/complexity vs L3 cache size, basically like a normal program running out of RAM and falling back on swap/pagefile.
Other software leans more heavily on GPU performance, or on just CPU core/architecture performance(photoshop, afaik, only really cares about CPU frequency and in-chip/system memory latency? GPU-accelerated vector drawing software might be really hard on the GPU, but idk I haven't used much of that extensively).
Krita, however, will eat everything you give it and ask for more, and it will use it all, at the same time.

On that note, try to get something with a solid cooling solution. Laptop means that the CPU and GPU share eachothers' heat output, and they tend to be designed so that your CPU can work, or your GPU can work, but not both.
Also, if you want to save on battery, don't hover over your GPU accelerated canvas. Just updating the cursor will keep your GPU loaded. So will filling the screen with a high resolution canvas. It's basically canvas-pixels on-screen = GPU load as long as something visual is updating.

This is going off linux, though. Windows might behave differently. I remember Krita not working well last time I used it in Windows, but that could have been a thing with my setup.

Hey guys, I'm enrolled for my masters and I feel like I need to change my laptop. Do you have any suggestions? Indeed, mac book is the best option, yet it exceeds my budget. I don't need anything super powerful, I will mainly need it for light programs, such as SPPS and all of that academic stuff. I've looked on many forums for ideas, do you think I can choose something from this website:https://thecursedcrusade.com/best-laptop-for-mba-students/ ? This article is written for students in my position, however I don't know if their recommendations are accurate.

Depends on how much money you will be able to spend. A Lenovo Yoga that actually yoga's and isn't just very thin but does come with a pen is what I use, and I'm happy with it. I'm getting a lot of complaints about Surface Books these days, and I don't know why, but I've never touched one myself. If you are extremely wealthy and want to have a really good workstation type laptop because you're also going to do 3d modelling and stuff, look into a HP Z-book.