Korriban
Willpower +2 (X: 529, Y: 65)
This datacron can be seen as soon as you leave the taxi station in the Lower Wilds.
Endurance +2 (X: 150, Y: 78)
Right near the shuttle.
Red Matrix Shard (X: -55 , Y:379)
In the open area right before entering the heroic quest tombs.