A short, useful read for the Malachain community.
The rule of thirds divides the frame into a grid of nine equal parts using two horizontal and two vertical lines. Placing the main subject along one of those lines, or where two of them cross, usually creates a more balanced and interesting picture than placing it dead centre. Most phone cameras can display this grid on screen through a simple setting.
For landscapes, put the horizon on the upper or lower line depending on whether the sky or the ground is more interesting. For portraits, place the eyes near the top line and leave space in the direction the person is looking. Like any rule it can be broken deliberately, but practising it first trains the eye to notice how position changes a photograph.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.