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By default, ST3 uses hard-tabs that are 4 characters long. This can result in hard-to-read code, as large tabular indents push your work to the right. I recommend all developers add this to their user settings (Sublime Text 3 => Preferences => Settings – User):

  {
    "draw_white_space": "all",
    "rulers": [80],
    "tab_size": 2,
    "translate_tabs_to_spaces": true
  }

This setting converts hard-tabs to spaces, makes indents only two characters long, puts a ruler at the 80 character mark (to remind you to keep your code concise), and adds white space markers. Here is a complete list of preference options

if you wish to continue customizing your ST3 environment.\