Here's a concise guide for the "Solo Venture" quest in Genshin Impact, based on general knowledge up to early 2024 and common practices in quest walkthroughs.
Unlocking the Quest 
1.Prerequisites: You typically need to complete certain prior quests or reach a specific Adventure Rank. From the information available, it seems you need to finish the Prologue: Act 3 Archon Quest "Ending Note" and might require to be around Adventure Rank 15 or higher.
Quest Walkthrough
2.Start the Quest: Talk to Jack, who is located just outside the Adventurers’ Guild in Mondstadt City.
3.Locate Jack's Lost Items:
4.First Item: Teleport to the Temple of the Wolf. Head to the marked area, which might involve climbing a short cliff north of the temple and then moving northeast. Here, you'll encounter some hilichurls and a barricade to destroy. Investigate the spot to find Jack's Map or an equivalent item.
5.Second Item: Continue following the path or the quest markers to another group of hilichurls. This investigation point should yield Jack's Adventurer’s Handbook or another significant item.
6.Return to Jack: After collecting both items, head back to Jack in Mondstadt to conclude the quest.
Quest Rewards
•Adventure EXP: 100
•Mora: 6,000
Other Items:
•4 Adventurer’s Experience
•5 Teyvat Fried Egg
Quest Tips 
•Combat: If you encounter enemies like hilichurls, use characters with wide-area attacks or elemental reactions to clear groups quickly. Anemo characters can be particularly useful for crowd control.
•Exploration: Use your map markers efficiently. If you've unlocked nearby waypoints, teleporting can save time.
•Character Selection: Since this quest doesn't seem to require specific elements for puzzles, bring your most versatile or combat-ready team to deal with any enemies swiftly.
•Post-Quest Interaction: Sometimes, talking to NPCs after quest completion can lead to additional lore or minor rewards, though this isn't always the case.
Remember, while this guide should cover the general steps, Genshin Impact occasionally updates quests or changes details, so if there's any discrepancy, follow in-game instructions or look for the latest updates on community platforms like X or game forums.
