1st Person Camera Set - up

I want the player to be able to navigate the world, smoothly and easily.

This video, produced by holistic3D.com explained the process simply.
https://youtu.be/blO039OzUZc

Basically you need to do the following:

1. Create a capsule object 
2. Fix the X and Z axis gravity (so you don’t fall over!!) 
3. Move the main camera inside the capsule. 
4. Under the capsule in the object hierarchy, Move the camera object beneath it. 
5. Set the camera motion so that the player can look around. 

Make sure the objects in the environment have colliders set otherwise the capsule could fall through the scene. The player needs to feel that the capsule drops as the floor drops/rises etc. 

The video shared a couple of c# scripts which will help to create great first person navigation.