Buying a new laptop - Dell XPS 15 laptop

Most blue screens are caused by hardware issues (Dell isn't known to have particularly bad hardware, and the XPS is their top line) or by software you install yourself (like wrong drivers or malware)
Occasinally it's a bad Windows update, but only Microsoft can be blamed for that.

Let me quote from one review as a warning: "This isn't a dedicated gaming machine, but the presence of a decent graphics card means gaming is possible, as is 3D rendering and modelling." So if gaming is your primary use (and study only secondary) this might not be an optimal choice.

Like all Dells, these machines are configurable. Important choices to make: disk (SSD, HDD; how big) and CPU (I5, I7).

I like that model line. And the awful truth is that I've yet to find any PC that never bluescreened. The only thing I've noticed is that in the past years the bluescreens have been trending down with an notable exception.

Malware, torrents and cracks. If the owner has any of those, the bluescreens are more common. So that's not a make or model issue.

When it comes to gaming laptop, you can consider about other good gaming brand such as, MSI or Alienware. MSI GS series is good option as well. It comes with top-notch spec and many gaming features (Nahimic sound enhancer, cooling system steelseries keyboard and so forth), not mention it is real thin and light gaming laptop.

I don't think the Dell would be a good enough gaming laptop. As @Eva0621 said, I would go to MSI as well. I have MSI GE series as my first gaming laptop. I have great experience on it! It has many different and powerful performances and features! It would be a good consideration for you!