Kashyyyk is the fourth planet you'll visit in Star Wars Jedi: Fallen Order. The planet is currently embroiled in a war between the Resistance and the Empire.
This first visit to Kashyyyk will be relatively linear--it's better to save your exploring on the return trip.
Video Guide: Part 9
Due to the ongoing battle, you'll need to "sneak" your way onto Kashyyyk, which Cal will do in the very un-sneaky way of taking over an Empire walker and defeating the troops attacking the Resistance.
You'll start in the water, so swim towards the nearest Walker. You'll notice it'll have some vines on its front leg, so use that to start climbing the massive machine.
You'll eventually jump and jump your way to the back, then get on top of the Walker. Jump on down to enter the Walker, then climb over the vehicle to the left. You can't use it, it's just in the way.
After the scene of Cal taking care of the Walker pilots, you'll be able to control the Walker and blast the Empire away. Just keep moving forward, blasting and shooting the troopers along the way. In the final section, take care of the Empire backup as it appears, and then near the end, make sure to look up and take the large Empire ship out of the sky.
After this, you'll meet Saw, the current leader of the Resistance. He doesn't know Tarfful's location--however, he thinks some of the imprisoned Wookies may be able to help. Saw needs your help freeing them, and you need the information, so you have your next task.
There's only one way to go, so head through the hanger into the Forest Trench. Wall Run and when you hit the ground BD-1 will want to scan something. Do so and your objective will be marked on the map.
Head back just a bit from where you are to find a room with a workbench--but before you use it, a Wyyyschokk will appear.
