Colour is the quickest way to make a week readable at a glance — one subject per colour, or a highlight on the thing you must not forget.
Highlight some text
- Click Edit on the lesson box.
- Type your text, then select the part to highlight.
- Click the highlighted A near the left of the toolbar.

That applies whatever colour the A is currently showing. To use a different one, click the small arrow beside the button and pick from the palette, then apply it.
The button next to it — the grid of colour squares — sets the text colour rather than the highlight.
Colour a whole box
Rather than highlighting words, you can give the entire cell a background colour. This is what most teachers use to colour-code subjects, so a glance down the week tells you which block is which.
Colour and repeating plans
Colour is saved with the entry, like any other formatting. So if you set a box to repeat on your cycle for all weeks, every occurrence carries the same colour — colour-code once and the whole year is done. See Repeat a plan across the year.
Before you print
Printed output leaves colour out unless you ask for it. If your colour-coding matters on paper, see Printing with highlighting and color — otherwise a carefully coloured week prints as plain black text.
Colour is doing real work for readers who skim. Use a few strong colours consistently rather than many; a week where every box is a different colour is no easier to read than one with none.