SSD fails to initiate - iMac 2015 Monterery

First off .....have just over to Apple after 30+ years using Windows ;

So disk that fails is Internal SSD Drive following info:-

Volume name : SSD

Volume type : APFS Startup Snapshot

BSD device node : disk1s1s1

Mount point : /

System : macOS 12.7.6 (21H1320)

File system : APFS

Connection : SATA

Device tree path : IODeviceTree:/PCI0@0/SATA@1F,2/PRT0@0/PMP@0

Writable : No

Is case-sensitive : No

File system UUID : 4788D165-76DE-4661-885B-E1C5C3936AD3

Volume capacity : 1,022,876,135,424

Available space (Purgeable + Free) : 991,593,895,432

Purgeable space : 4,869,129,736

Free space : 986,724,765,696

Used space : 15,418,023,936

File count : 367,352

Owners enabled : No

Is encrypted : No

System Integrity Protection supported : Yes

Can be verified : Yes

Can be repaired : Yes

Bootable : Yes

Journaled : No

Media name :

Media type : Generic

Ejectable : No

Solid state : Yes

SMART status : Not Supported

I have probably setup my drives incorrectly & I'm hoping that's all it.

Have tried & spectacularly failed to screenshot of offender so I type it below:-

APFS Volume Group • APFS

Used: 32.4gb Free:986.7gb

Mount Point Read Only/

Capacity 1.02gb

Available: 991.78gb (Purgeable 5.08gb)

Owners: disabled

SATA

disk1s1s1

And finally, below is what First Aid Reports:

Running First Aid on “SSD” (disk1s1s1)

Verifying the startup volume will cause this computer to stop responding.

Verifying file system.

Volume could not be unmounted.

Using live mode.

Performing fsck_apfs -n -l -x /dev/rdisk1s1

Checking the container superblock.

Checking the checkpoint with transaction ID 39080.

Checking the EFI jumpstart record.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking the encryption key structures.

Checking volume /dev/rdisk1s1.

Checking the APFS volume superblock.

The volume SSD was formatted by storagekitd (1934.141.2) and last modified by apfs_kext (1934.141.2.701.1).

Checking the object map.

Checking the snapshot metadata tree.

Checking the snapshot metadata.

Checking snapshot 1 of 1 (com.apple.os.update-CB0A7655FB68BF1B8B5973B5F00D93A3F92BA208F5379F3D5FF0D1F31BA7268C)

Checking the fsroot tree.

Checking the file extent tree.

Checking the extent ref tree.

Verifying volume object map space.

Verifying allocated space.

The volume /dev/rdisk1s1 appears to be OK.

File system check exit code is 0.

Restoring the original state found as mounted.

Operation successful.

Point is, I've diagnostic & appears fine, however if I have laid out drives wrongly, afraid a little OCD with error reports I read could be failing & and "prepare for worst" eek!

Any advice welcomed i.e. do I need to be concerned? Please be kind I'm a newbie!!

TIA

Ian Roe