As you talk to people, notice things and just generally walk around during "Nexus Reunion," you’re going to pick up a few extra side missions. This is how Mass Effect: Andromeda works. What’s important to learn here is how to manage all of those to-do lists. (We talked about this in the first guide as well.)
Open up your journal from the Mass Effect: Andromeda menu. You’ll see the five folders containing the missions you have available. Scroll down to the fourth folder, additional tasks, and hit the button to toggle tracked. This will mark the four locations of the "Getting to Know the Nexus" mission on your map and HUD (and get rid of the markers for other missions).
When you pick up other missions (like the two Heleus assignments you’ll find while completing this mission), you can do the same thing. No matter which mission is currently active, updates to your to-do lists will pop up in the upper right corner of your HUD as you complete tasks. Learning how to focus is going to help you a lot. This is just the second Mass Effect: Andromeda mission, and things were starting to get a little overwhelming for us.