Dagobah
The Vision
Holocron #21 Experience Point: This is above the Rogue Shadow right where you start and exit from in the cutscene. Behind it will be a rock, use this rock to jump onto the Rogue Shadow and then just jump in the middle of it to grab the Experience Point.
Holocron #22 Blue Bacta Tank: This is right underneath the rock you used to climb onto the Rogue Shadow to grab Holocron #21. Just move the rock with the force to easily grab it.
Holocron #23 Saber Crystal: This Saber Crystal will be found once you jump out of the area you were in to the area above. You will see a hut ahead of you on the path; it will be to the right of the hut in the trees.
Holocron #24 Green Bacta Tank: This Green Bacta Tank will be underneath the rock ahead from the hut on the path to your left. This will be right before the next 2 Holocrons before you enter the hut and cutscene with Yoda.
Holocron #25 Saber Crystal: This is an unmissable holocron. It will be right along the only path you can take to enter the hut. This is just right after you grabbed Holocron #24.
Holocron #26 Experience Point: This is an unmissable holocron. It will be right in front of the hut before you enter it. It is impossible not to see and just right after grabbing Holocron #25 along this path too.