Title stolen from here:

Each month is an annually renewable technical or personal challenge:

  • Go analog.
  • Stay healthy.
  • Embrace the uncomfortable.
  • Learn a new programming language.
  • Automate.
  • Learn more mathematics.
  • Focus on security.
  • Back up your data.
  • Learn more theory.
  • Engage the arts and humanities.
  • Learn new software.
  • Complete a personal project.