adding ckeditor color button and font size I am new to drupal.
I am using drupal  8.2.5, bartik theme and i would like to add font size&amp;family and colour buttons to the ckeditor.

i installed the "CKEditor Font Size and Family" module, enabled it and then at "admin-configuration-content authoring-text formats and editors" i configured "Basic HTML" and "Full HTML" and drag the new available buttons of fonts and size to the toolbar. I saved it and then when i tried to add new content (article or basic page), the editor was completely gone, there was only the field of "summary" available to write something!
When i disabled the module, the text editor was back to normal.

Later, I noticed at the module page that the installation process was the following:


Download the plugin from http://ckeditor.com/addon/font.
Place the plugin in the root libraries folder (/libraries).
Enable CKEditor Font in the Drupal admin.
Configure your WYSIWYG toolbar to include the buttons. 


So I realised i hadn't followed step 2. I don't know where the libraries folder is, although i searched and have no experience how to create it correctly and how to place this plugin there. 
I read various posts on the internet but couldn't find a solution and then i ended up here. 
Thank you.
You have to create the folder yourself as the docs say.

You can do this with command line with mkdir libraries in the webroot (where the /core folder is), or with a window and New Directory (New Folder) in either Windows / OSX.

Your application structure will then look like...

/core
/libraries
/modules
/themes


and so on.

All thats left is to download the JS plugin from ckeditor.com (v 4.5.x), unzip it, and place it in the libraries directory.