Getting these errors and I am very new to unity and know little to nothing.

Following an fps game tutorial on YouTube: #1 FPS Movement: Let's Make a First Person Game in Unity! - YouTube
I know nothing about unity and I need help. Thanks -Carter

1) When making a float, you need to use an f at the end; 1.25f
2) IsGrounded = controller.isGrounded (remember, the first letter of a variable is usually lowercase)
3 & 5) It should be Time.deltaTime (Time is a class, therefore it needs to be capitalized)
4) Will be fixed when you fix #3. Its caused because isGrounded wasn’t correctly called

Hope this helps