You learn the four tabs at the bottom and the windows they open.
You want to know what the four tabs and the Home screen open.
Look at the bottom of the screen
Tap Home, Execute, Habits or Insights

Look at the first card on Home
Read the Next step card
It shows what to do now.
Tap the button on that card
Go straight to that step

Scroll down the Home screen
Read the rows under Discovery, Planning, Execute, Habits and Insights

Open Execute on today's panel
Tap Plan the day or Reflect on today
You do not know a word on a screen, and a question mark is next to it.
Look at the question mark on a computer
Hover it to read the meaning

Tap the question mark on either device
Open the full help window

You want a different week, month or year without stepping through each one.
Open Execute on a week, month, quarter or year panel
Tap the bar title

Look at the timeframe tabs in the Which period? window
Tap another timeframe, or keep the one shown
Look at the list under the tabs
Tap the period you want
Nothing moves yet.
Look at the bottom of the window
Tap Open
The panel switches to the period you picked.