How to correctly write alt and title for an image?

Question

Search Engine Optimization

How to correctly assign alt and title to an image? Searches on the Internet did not give anything, but only made everything more complicated, since different seo blogs provide different information.
For myself, I realized that I need to do this:
title- alt and title for the image
alt- we write the correct alt and title for the image
To be more specific:
1. title We give a short name for the image
2. alt We paint in more detail what is on the image
So This?