Hello.
Because this is my very first time installing anything other than Windows, I need help.
After watching some videos of how to install KDA neon and Windows 10 so they dual boot, I came upon an error. "The partition table on *hard drive* already has 4 primary partitions, and no more can be added....". I have Windows 10 already installed for a while, with it being split into two volumes, but there's this 500 mb partition I don't know what is. And because of me wanting and not being able to install, I beed you guys to help.
So the /dev/sda1 is named as Windows 10 and is 50 mb partition, second is C drive for windows and is 163gb, third is the unknown 500mb one and fourth is disk E (idk why, don't ask me) which is my secondary partition in Windows 10 with around 600 gigs.
What should I do in this situation? What is the 500mb partition and how to install KDE neon on here? Also note that I have Free space of total of 150gb which I'm gonna use for KDE neon so I don't have to shrink anything.
Please explain in detail or as best as possible, as this is my first time doing something like this and English is not my first language, so I might not be able to understand everything without help.
Thank you in qdvan!

So it turns out it's a Recovery partition. Do I even need that? I mean, I have no other options than deleting that, right?

Traditional MBR boot sectors can only house 4 primary partitions. It looks like you have all 4 allocated and used. The trick will be to get one of the primary partitions turned into an extended partition that can house larger numbers of logical partitions that can in turn house your original data and the new Linux installation. The data would most likely need to be shifted off onto temporary backup storage in the meantime. You could use a partition manager (eg fdisk or gparted) to delete the partition, recreate it as an extended partition and restore the data, before then going on to try the new install of Linux.

This is a fairly advanced sequence of actions, and as a new Linux user I predict you stand a good chance to accidentally delete your entire hard disk contents, which would be discouraging.

Have you considered instead doing your first Linux installation on a blank hard disk, either in this computer or another one?