This page of the guide to Dragon Ball Z: Kakarot has a walkthrough for the Foreboding Fear side quest.
Time frame: From Attack of the Saiyans - Episode 7: Intermission to Episode 7: Intermission
Reward: 4,583 PD, D Medal, Brain Bread, Mega Mass Lvl 1.
Where to start: West Area, as Gohan.
Accept the mission and move to the Lucca Village.
Your task is to get to the crater. You may encounter opponents - defeat them to get inside.
After that, go back to the woman. This will complete the quest.