Pick one focal length and use nothing else for thirty days. Not a zoom set to a fixed point — a prime. 28mm, 35mm, 50mm, whatever you already own or can borrow. The constraint is the project.

Zooms make you lazy. When you can change focal length, you change it instead of moving. A prime forces you to use your feet. You learn what 35mm sees. You stop thinking about focal length and start thinking about everything else.

By the end of the month you'll have a native understanding of that focal length. You'll know how close you need to be, how much sky you get, how the background compresses or doesn't. That knowledge stays with you permanently.

Watch for: the urge to break the rule. Every time you feel it, ask what you'd have to do with your feet to get the shot instead. Often the answer is simply: get closer.

The point: constraints sharpen your eye. Limitation is not a punishment — it's a shortcut to fluency.