How to start a statement with ‘what’

Starting a statement with ‘what’ is a way to show variety in your essay. The following sentences are constructed using ‘what’ as the initial word for each one:
1 What greeted me was a dog that barked ferociously at me.
2 What prompted me to act was the urgency of the situation then.
3 What I don’t like about girls is their chattering habit.
4 What they did there was not my concern.
5 What I write in this post is for readers to read.
Happy making sentences that start with ‘what’