如何学习框架（rails）？

I leaned ruby, but the syntax and the file structure in rails is very difficult for me to understand, there are many things that I need to follow their "rules" to do, for example, I need to generate the db using the migration... It is not suggested to do with typically typing SQL cmd, it makes me very difficult to move on... Any suggestion on how to learn the whole file and how the structure works? Thank you. I leaned ruby, but the syntax and the file stru