Photograph something once a day, week, or year.
If you photograph something once a day for a week or two, you'll learn more than you think you will about light.
Longer projects are possible, too.
Nicholas Nixon has been photographing his wife, and her sisters, annually, for over thirty years.
These two families have been documenting themselves for many years:
Time Goldberg familiy
Diego (19/07/73) - Eli (06/01/76) - Martín (16/4/82)
You can start an annual photography project.
The subject can be family, or something else, such as a garden.
Duane Michaels did a seasonal project.
He photographed his garden each season, and hand colored the B&W prints.
The Four Seasons of Our Garden
Duane Michaels