This mission serves as an introduction to the actual game. All the privileges, such as the dot of your scope, which shows exactly where the bullet goes, can be switched off in other missions (this depends on the difficulty level - easy will keep these settings, while the other two will not).
Get use to the controls and follow Robert. At one point he will ask you to scan the area, so use the scope attached to your rifle and drag it to the marked spot. Do that and move towards the right side of the cliff. Now enter Scout Mode to search the area for clues. You will find out that you can climb the neighboring wall, so use it to reach the next checkpoint. On your way, you will attacked by a wolf and the only way to free yourself is killing the animal via pressing the right buttons (presented on the screen).
Now, you will have to pass an abyss. Select explosive ammo XM2015 and hit the tree located on the other side. Your next task will be to crouch and hide in the nearby bushes from the incoming helicopter. At this point you will come across a pack of wolf and you will have to possible means of dealing with them: you can listen to Robert and sneak past them, and engage in combat and kill them. The choice is yours to make.
Reach the next hill and you will have to analyze some objects. Use this mode to find footprints. Follow them and you will find two hostile soldiers. Your task will be to take out the enemy on the right silently. In order to avoid his line of sight, move to the right and once you eliminate your target, take the drone from your brother. Use it to tag six enemies located nearby. Two of them are located on the buildings and three more are on the ground.
Robert will mark targets that you are supposed to eliminate first, and thus get to know aim and fire mechanics. Your first target will be located over 250 meters away from you, so adjust elevation on the right of the scope to 250 and only then take the shoot. Draw your attention to the fact that the red dot will tell you where the bullet will land. A bullet fired from such a distance will be affected by the wind (Coriolis force was overlooked), and if you play the game on hard or challenge difficulty level, you can only relay on the information on the wind. Eliminate the remaining targets in the same way. To take out the third target you will have to wait for the patrol to split up. In case of the fifth and sixth target, you will have to aim for the head of the first one in order to kill the soldier in front of him.
Reach the facility and sneak up to the soldier and interrogate him. You will learn interesting things about soldiers patrolling the area. Just let the soldier finish the phone conversation. As soon as you get inside, change your weapon to the assault rifle and eliminate all the nearby enemies. Move forward and you will come across a chest that can be used to get into the CCTV server. Use this to find the location of remaining enemies. Eliminate them and plant explosives in the marked location. Exit the area with Robert to complete the task.