Partitioning Ubuntu 24.04.2 after last bug resolved

On my last fixed issue for gdm3-fails-to-start-after-package-updates-in-ubuntu-24-04 which was resolved by Manfred Hampl I now am at a loss as to what sizes I should make my partitions on my drive to give my pc more space.

GParted was not used during install of Ubuntu 24.04.2 and in time I arrived at my last resolved/fixed bug. Thanks Manfred.

Now I am unsure of what sizes to give each partition for best performance/efficiency of my system.

On GParted it lists the following.......
Partition Name Filesystem Mount Point Label Size Used Unused (No Flags)
/dev/nvme1n1p1 EFI fat32 /boot/efi 'EFI System 600MiB 27.07MiB 572.93MiB boot, esp
/dev/nvme1n1p2 fat32 PQSERVICE 5.80GiB --- --- boot, esp
/dev/nvme1n1p3 - ext4 / 1.86TiB 482.90GiB 1.39TiB
(key symbol)

This is all confusing to me - I also have another partition called /dev/nvme0n1p1 MS reserved partition unknown 128.00MiB with 1.86TiB unallocated which carries this warning flag on it - Unable to detect filesystem! Possible reasons are:
- The filesystem is damaged
- The filesystem is unknown to GParted
- There is no filesystem available (unformatted)
- The device entry /dev/nvme0n1p1 is missing

/dev/nvme/1n1p2 above carries the same Warning on it.

lsblk - NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 1 976.6G 0 disk
├─sda1 8:1 1 5.9G 0 part
├─sda2 8:2 1 5M 0 part
└─sda3 8:3 1 300K 0 part
nvme0n1 259:0 0 1.9T 0 disk
└─nvme0n1p1 259:1 0 128M 0 part
nvme1n1 259:2 0 1.9T 0 disk
├─nvme1n1p1 259:3 0 600M 0 part /boot/efi
├─nvme1n1p2 259:4 0 5.8G 0 part
└─nvme1n1p3 259:5 0 1.9T 0 part /

lsblk -f -
NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
sda iso966 Jolie Ubuntu 24.04.2 LTS amd64 2025-02-15-09-15-26-00
├─sda1
│ iso966 Jolie Ubuntu 24.04.2 LTS amd64 2025-02-15-09-15-26-00
├─sda2
│ vfat FAT12 ESP B5A5-8010
└─sda3

nvme0n1

└─nvme0n1p1

nvme1n1

├─nvme1n1p1
│ vfat FAT32 'EFI System 8C6E-FEE8 572.9M 4% /boot/efi
├─nvme1n1p2
│ vfat FAT32 PQSERVICE 8C81-6C92
└─nvme1n1p3
     ext4 1.0 f3528e7c-d2f5-4ee1-b340-e9805b012a6a 1.3T 24% /

sudo fdisk -l -
Disk /dev/nvme0n1: 1.86 TiB, 2048408248320 bytes, 4000797360 sectors
Disk model: SAMSUNG MZVL22T0HDLB-00BLL
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 5B9130C2-CC7C-4F2B-8CA6-0631BA01703C

Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 264191 262144 128M Microsoft reserved

Disk /dev/nvme1n1: 1.86 TiB, 2048408248320 bytes, 4000797360 sectors
Disk model: SAMSUNG MZVL22T0HDLB-00BLL
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 2EB3F19D-552A-4DC9-851D-D3404AF49B0E

Device Start End Sectors Size Type
/dev/nvme1n1p1 2048 1230847 1228800 600M EFI System
/dev/nvme1n1p2 1230848 13394327 12163480 5.8G EFI System
/dev/nvme1n1p3 13395968 4000796671 3987400704 1.9T Linux filesystem

GPT PMBR size mismatch (12389099 != 2047999999) will be corrected by write.
The backup GPT table is not on the end of the device.

Disk /dev/sda: 976.56 GiB, 1048576000000 bytes, 2048000000 sectors
Disk model: ProductCode
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B0EF6CA3-60D1-4A21-98D9-17C385A8B6F8

Device Start End Sectors Size Type
/dev/sda1 64 12378291 12378228 5.9G Microsoft basic data
/dev/sda2 12378292 12388435 10144 5M EFI System
/dev/sda3 12388436 12389035 600 300K Microsoft basic data

sudo parted -l
Warning: Not all of the space available to /dev/sda appears to be used, you can
fix the GPT to use all of the space (an extra 2035610900 blocks) or continue
with the current setting?
Fix/Ignore? Fix
Model: VendorCo ProductCode (scsi)
Disk /dev/sda: 1049GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
 1 32.8kB 6338MB 6338MB ISO9660 hidden, msftdata
 2 6338MB 6343MB 5194kB Appended2 boot, esp
 3 6343MB 6343MB 307kB Gap1 hidden, msftdata

Model: SAMSUNG MZVL22T0HDLB-00BLL (nvme)
Disk /dev/nvme0n1: 2048GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
 1 1049kB 135MB 134MB Microsoft reserved partition msftres

Model: SAMSUNG MZVL22T0HDLB-00BLL (nvme)
Disk /dev/nvme1n1: 2048GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
 1 1049kB 630MB 629MB fat32 EFI boot, esp
 2 630MB 6858MB 6228MB fat32 boot, esp
 3 6859MB 2048GB 2042GB ext4

I have now tutored myself on GParted via this youtube video https://www.youtube.com/watch?v=Q1vybl1X3_s

Would you have any recommendations for sizing my partitions please. I am not too sure what sizes I should give and would my allocating /home partition on my other drive be advisable as it does contain many books, magazines, whitepapers which is ever growing and so taking up some space. I think I can then place a link to that drive on my desktop for ease and quick reference access.
Your thoughts greatly appreciated.