Capsicam in my house

This is first month of the year 2019, l brought 4 capsicam tree which have some capsicam. All of them are green. But this is unknown for me about red & yellow capsicam. So, I request all of my family member for not to cut off any capsicam. As a result I found that firstly the capsicam created with green colour then it goes to black colour and finally it goes to red colour which called red capsicam.