It is recommended to unlock the following two skill first:
Survival Skills: Cal’s maximum life increased.
Superior Blocking: Cal’s defenses are improved, allowing him to take less block damage from incoming attacks.
These two skills are important for surviving early in the game. Later, you can take Enhanced Survival Skills and Force Attunement to further enhance Cal’s abilities. The following skills are recommended next:
Dash Strike: Cal dashes forward and attacks his target. Jump while dashing to flip over the target instead.
Empowered Slow: Holding Slow allows Cal to slow his target for a longer duration.
These offensive abilities are very useful. Dash Strike (and Sprint Strike) make things easier in difficult combat situations, as they can blast through enemy shields. It is especially useful when trying to deal with the Nightbrothers on Dathomir. Empowered Slow makes Slow even better. Slow is a great ability in combat for controlling waves of enemies — just shoot an enemy with Slow to be able to defeat them quickly. It is recommended to start with the Survival Tree. Improved Stims and everything in the Survival Tree should be your priority on higher difficulty levels, and unlocking these skills will make defeating harder enemies and bosses easier.