Question Ignoring collision between specific entities

@CunningFox146 :
You can use the

CollisionFilter

in your collider for this purpose, as @tertle pointed out.
Have a look at its scripting API documentation.

Every collider holds a collision filter (see Collider.Set/GetCollisionFilter).
You can use the

CollisionFilter.BelongsTo

property to assign the given collider to different categories (or layers as in standard GameObjects).
With the

CollisionFilter.CollidesWith

property you can enable or disable collision of this collider with different such categories (or layers).
Both properties are bitmasks that you can modify using standard bit manipulation, e.g., setting the n'th bit in one of these properties using

property |= 1 << n

.

Note that if the collision filter in one of two overlapping colliders dictates that it should not collide with the other, then the collision is disabled. In other words, the filters in both colliders need to indicate that a collision should occur for the overlapping collider pair to actually collide.

Finally, the

CollisionFilter.GroupIndex

that @tertle pointed out above allows you to further group colliders and override their filter behavior altogether. If the

GroupIndex

is non-zero the following behavior is observed:

• If in a pair of overlapping colliders, both colliders have the same positive

  GroupIndex

  value, they always collide.
  
• Contrary, if in a pair of overlapping colliders, both colliders have the same negative

  GroupIndex

  value, they never collide.

Let me know if this helps.