Here you can find Walkthroughs for all Side Quests (also called Favours / Favors) in God of War 2018.
Below are links to all of the Side Quests in GOW:
Midgard – Dwarven Favours:
Midgard – Wayward Spirit Favours:
Midgard – Dragon Favours:
Niflheim – Dwarven Favours:
For All Main Quests please refer to the God of War Story Quests Walkthrough.