I never get tired of answering questions about my favorite game series of all time!bangobango said:
You get tired of answering these, just let me know. I have tons more questions and I really appreciate your answers.
Next question(ish) - I do not get investigations. Selected one to hunt a great jagtas. Killed great jagras. Investigation is still there.
Investigations are repeatable, there will be a number on the right side of the list next to the investigation showing how many times that investigation can be completed. The reason you want to do investigations is that they give bonus rewards. You'll see at the bottom of the description of the investigation a number of colored reward spaces, either bronze, silver, or gold. Those have varying chances of giving you rare materials. Whenever you are grinding for materials to make armor or weapons, you always want to do investigations instead of optional quests because they will give more and better rewards.
Investigations also give higher money rewards and usually come with different restrictions. You might be limited to 2 players instead of 4, you might only be able to cart once instead of 3 times, it might have a 15 minute timer instead of 50, etc.