Major contexts have parentheses: (Work), (Personal), (Family). This makes them stand out, so you are reminded to always assign them to your tasks. Use short, simple names.
Once you decide on your life areas, you will label a tab for each major context at the back of your planner, with one or two blank pages behind each tab.
Abbreviate major contexts when writing them in your Do Today list: (W), (P), (F). Write these abbreviations to the left so they line up and you can scan them.