Inversion means putting the verb before the subject.
It is a technique in which the normal order of words is reversed, generally for emphasis or special effect.
The sentence will be more noticeable and unusual. It will also sound quite formal.
Inversions are more common in written English than in spoken.
Example 1: I had never visited Egypt.
Example 2: Never before had I visited Egypt.
In example 2 the inversion is used to emphasise the fact that in your whole lifetime
you had not visited Egypt.
It can be sometimes difficult to remember when inversion is or can be used.
See on page 2 when inversions - in normal everyday English - are used.