Start on the Child Profile tab — name, date of birth (the age works itself out), school, health basics and key contacts. Then each tab is a simple, dated list: exams and fees on Education; verses and dedications on Faith; appointments and medications on Health; training and matches on Exercise; gift ideas and party plans on Birthday & Gifts; the firsts worth keeping on Milestones.
Yellow cells are yours to type in; grey rows are examples you type over or delete. Sort any tab by its Date column to see what is coming up next. There are dropdowns for status so a glance tells you what is still to do.
It is completely private — the file lives on your device, and you can copy it once per child. Prefer an app you open like any other on your phone? The free Mzazi app installs to your home screen and does the countdowns for you.