I wanna start back-end ..... some help

i wanna start in back-end field so i need some recommends for the plan that should take or structure and the source for this study . thx

Few weeks ago someone posted this resource: Roadmap to web developing 2018.
It feels overwhelming but you can start from some tutorial on MDN if you want to stick with javascript:Introduction to Node / express - MDN

I prefer the backend too. Two things I wish someone had told me about backend development:

  1. Learn about templates. Pug or handlebars for express and jinja for python flask.
  2. A huge part of backend is the unit testing using mocha and chai. Learn it at the same time as everything else.

This guide is good.