This chapter of the guide to Dragon Ball Z: Kakarot has a walkthrough for Guardian Caretaker side quest.
Time frame: From Android Terror Arrives - Episode 10: Intermission to Episode 10: Intermission
Reward: 168,013 EXP, D Medal, Plush Shenron
Where to start: Kami's Lookout Area, as Gohan.
Start the mission and go to Olive Village. Get to the river and look for woodchips.
Each chip is located near a larger branch, making them easy to spot.
Get the items and return to the quest giver.