My Sublime Text 3 user preferences

Preferences.sublime-settings.JSON

{
  "bold_folder_labels": true,
  "caret_style": "wide",
  "color_scheme": "Packages/Alchemist/Alchemist.tmTheme",
  "draw_white_space": "selection",
  "enable_tab_scrolling": false,
  "ensure_newline_at_eof_on_save": true,
  "font_face": "DejaVu Sans Mono",
  "font_size": 12.5,
  "highlight_line": true,
  "ignored_packages":
  [
    "Rails",
    "Vintage"
  ],
  "line_padding_bottom": 3,
  "line_padding_top": 3,
  "open_files_in_new_window": false,
  "scroll_past_end": true,
  "tab_size": 2,
  "theme": "Spacegray.sublime-theme",
  "translate_tabs_to_spaces": true,
  "word_wrap": true,
  "wrap_width": 100,
  "indent_guide_options":
    [
      "draw_normal",
      "draw_active"
    ],
}

How to use this? Kindly share tips