Most of this info is found at
https://en.blender.org/index.php/Dev:2.8/Source/LayersCollections/API-Changes
https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Python_API
my condensed version to self is:
linking objects to scene in 2.80
- bpy.context.scene.objects.link
+ bpy.context.collection.objects.link
setting object to active in 2.80
- bpy.context.scene.objects.active = ob
+ bpy.context.view_layer.objects.active = ob
object.to_mesh in 2.80
+ obj.to_mesh(bpy.context.depsgraph, apply_modifiers=bool, calc_undeformed=bool)
selecting objects
- object.select
+ object.select_get()
+ object.select_set()
