On this page of the guide to Watch Dogs Legion, you will learn how to complete the second mission from the Chapter Kelley's Missions - part 2, i.e. Market Closing. The mission is to hack the cameras and other devices in NeoGate.
Your next assignment will be to go to NeoGate to hack the camera.
When you get there, you'll notice a locked door. Put the spider-bot on the other side and take control of it. Then go to the terminal to unlock the door. Watch out for the guards, though.
Once inside, there will be a ventilation shaft on the left side. Open it and put the arachnid in there, then start controlling it. When you get to the end of the vent, jump down, on the left side, there is another shaft, open it and go ahead.
Get the access key, then go back to control your character and head to the door. In the middle are the next opponents.
You can defeat enemies and climb alone to the top, or do it quietly with the help of the arachnid. Go inside and use the ctOS server. Switch to other cameras and listen to what the recorded people have to say.
Then go down the stairs and use the computer.
Another puzzle will appear, start from the left side, hacking the cameras located inside the room. Remember, after making the nodes on the left, switch to the camera on the right. Once you've connected the nodes there, go back to the first camera, unlock the switch, and wait for the overload to occur.
At the same time, the enemy will be alerted and will begin to attack you. Defend yourself until the moment of overload, and when it occurs, run away from the scene and complete the mission.