K1 Logistics, K1 Revelation, K1 Crew Quarters and K1 Communion are the Moon Lost Sectors you'll encounter in Destiny 2.
You can start exploring them all as soon as you complete the first Shadowkeep campaign mission, unlocking the Moon as a Patrol space.
Finding each K1 Lost Sector location will undoubtedly come in useful for certain questlines and bounties for Eris, so it's worth learning where they are for future use.
Be warned if you're just getting started with Shadowkeep, however - you'll need to be close to Power level 870 to stand much of a chance of surviving them.
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Destiny 2 K1 Logistics location
K1 Logistics is found within in Archer's Line.
Find the large building with the number '9' on the right side, where there's the Lost Symbol underneath on the outside.
Head inside this structure, and as soon as you do, take a hard left, through a red-rimmed doorway.
Turning the corridor right, you'll enter a collapsing corridor with several ghostly red figures throughout.
This is the right direction to take. Continue on, dropping down at the end with the 07 on the wall, and through the linear route.
You'll soon arrive at the entrance to K1 Logistics.
Destiny 2 K1 Revelation location
K1 Revelation is within Sorrow's Harbour, in the middle of the location.
To find it, locate the large plate in the ground, and look to the south west.
Walk ahead and just beyond the small hill, you'll notice a cave entrance in the crack in the ground.
Explore this linear tunnel to soon arrive at K1 Revelation.
Destiny 2 K1 Crew Quarters location
K1 Crew Quarters is found within Hellmouth, to the very south of the location.
Locate the symbol on the map, where you'll come to a cul-de-sac, with the Lost Sector symbol on a small unit.
From there, look past it to the south, where you'll see a doorway in a building just up a hill beyond.
Head through this doorway, and keep going until you reach the K1 Crew Quarters proper.
Destiny 2 K1 Communion location
K1 Communion is in Anchor of Light, in the far north-east of the location.
You'll know you're in the right place when you spot the Lost Sector symbol underneath the outside of an orange building when looking east.
Head inside the open structure and on the ground floor, to the right of a staircase leading up, is a doorway just beyond.
Head through, turn the two corners and the corridor will start heading down. Continue going down this linear path to reach K1 Communion proper.