Magento installation problem in frontend and backend

Hi Vimal Kumar, I am very sorry for the abuse. I’m from Venezuela, could you help me with something that really worries me?   1.- I have no knowledge of magento, however, I look for videos and install and it does not show me the backend and the interface does not look very good. 2.- how to backup in the Magento version see. 1.9.4.2 3.- How do I do the migration? to the most current