This chapter of the guide to Dragon Ball Z: Kakarot has a walkthrough for Stranger Danger side quest.
Time frame: From Majin Buu Reborn - Episode 8: Finale to No time limit
Reward: 249,984 EXP, D Medal, Super Power Protein, Fancy Necklace
Where to start: East Ravine Area, as Gohan.
To start this mission, you need to go to Olive Village. There you can find a man who will order you an additional story.
After talking to him, go to the specified location on the map to find out what you have to do.
Your next task is to get rid of the opponents. They shouldn't cause you any problems. You know their attacks, and. Also, their levels are below yours.
Kill enemies and go back to the quest giver. This will complete the mission.