Composition without rules to memorise
You do not need to memorise rules. You need to decide, before you press the button, what the photo is actually about — and then give that one thing room.
Pick one subject
A common reason a photo feels busy is that it is trying to show everything. Ask yourself: what is this picture of? The answer should be one thing — a person, a detail, a line of light. Everything else is supporting cast. If something in the frame does not help that subject, step or tilt until it is gone.
Off-centre usually feels better
Placing your subject dead in the middle can feel stiff. Nudge it toward one side or set the horizon a third of the way up or down. Many phones can show a grid overlay — turn it on in the camera settings and place important things near where the lines cross. After a while you will feel the balance without needing the grid.
Mind the edges
Before you shoot, run your eye around the four edges of the frame. A half-cut head, a bright distracting object in the corner, a pole growing out of someone's shoulder — these are the things you notice later and wish you had not. Clean edges make an amateur photo look considered.
Use lines to lead the eye
A path, a railing, a row of windows, the edge of a table — lines pull a viewer's attention along them. Point them toward your subject and the photo gains a sense of depth and direction instead of feeling like a flat snapshot.
Give motion somewhere to go
If someone is walking or looking to the right, leave a little space on the right side of the frame for them to move or look into. A subject pressed against the edge they face feels cramped.
One thing to try today
Take the same scene three ways: centred, off to one side, and one step closer. Keep the one that feels least cluttered. That instinct is composition.