What partitions?

I have a HP laptop that is dual boot Windows10 and Zorin 17.3. I want to delete windows10, but I get confused about partitions. I am uploading a screen image of the GParted readout of the laptop.

If someone could give me an idea of what partitions need to be deleted and those that should remain, I could rest easier before doing it. I don't want to delete a ntfs partition ie. that has boot reference to loading Zorin17.3 through the normal grub?

/dev...
/sda4
/sda7

And if you want to be thorough and reclaim all space Windows is hoarding, /sda3 and /sda6, as well.

Personally I would make a complete new installation after backing up all data.
Booting into live mode (Try Zorin) start install with 'something else' method. First delete all existing partitions. Next create the following partitions:

  1. /boot/efi 512 Mb FAT32
  2. / of 80 Gb formatted Ext4
  3. Extended partition;
    3a. Create swap partition double the size of your physical RAM at the end of the partition.
    3b. Everything to the left of swap area label as /home formatted to Ext4.
    Finally, choose sda for GRUB.

You could save Your Data and make a fresh Installation und during the Installation, you choose the Option ''Erase Disk'' and the whole Drive will be wiped and Zorin will intsalled on it. The Installer makes that all automatically.

If you want kepp Your Way here, You should delete the ntfs Partitions:

Then You have to navigate to /boot/efi/EFI/ and there should be a microsoft Folder You have to delete. Then make a sudo update-grub and then would be the Question if You want keep the GRUB Menu or not.

I initially thought to delete the ntfs partitions only. I will hold off for a bit as there is other windows software I may need to use yet, which doesn't seem available for Zorin. Thank you.