User Registration and Login for the frontend

Hi!

I am new to wordpress so don’t know all the details about this great CMS.

I just want to develop a site in WordPress so want some help from the experienced WordPress persons.

I want to create a Singnup and Login form just for the front-end. The user can also signup through Facebook or through custom registration form. After the user login they will get the author profile page where they can change their details and also the downloadable files which are for the registered users only, but cannot log in to the WordPress dashboard in anyhow or cannot see it. I want just like the following site:-

1. https://themeforest.net/

2. https://www.meritnation.com

Please help.

Thank you to all.