Trust level? can some explain this

i got a massage that says and i quote:
"We’ve promoted you up another trust level!

As an experienced user, you might appreciate this list of handy tips and tricks.

We invite you to keep getting involved – we enjoy having you around."
what is that?

Grats on the promotion, MMMansori!

You can find more info about trust levels in the sticky post over here:

Thank you for your contributions!