What is the weather like today? What do you mean?

What's the weather like today means: what's the weather like today; What is the weather like today? What is the weather like today?

What is it: what is it; What is it; what

Example:

1. What happened to both of you today? What happened to you two today?

2. What happened to him? What happened to him?

Knowing what is the right action is often just an instinct.

Knowing what is right and carrying it out is often just an instinct.