Standing in the paint aisle staring at a wall of nearly identical white cards is a rite of passage. Choosing paint gets much easier once you separate the decision into three smaller ones: finish, formula, and colour.
Start with finish, because it decides durability. Flat and matte hide imperfections and suit low-traffic ceilings and bedrooms. Eggshell and satin wipe clean, which makes them the workhorses for living rooms, hallways, and family spaces. Semi-gloss stands up to moisture and scrubbing, so it belongs on trim, doors, kitchens, and baths.
Next, the formula. Modern water-based acrylics suit almost every interior job: they dry fast, clean up with soap and water, and keep their colour without yellowing. Oil-based paint still earns its place on heavy-wear trim and metal, but it demands solvents and patience.
Colour comes last, and lighting decides it. Always test three large swatches and live with them for two days, checking morning, noon, and lamplight. A shade that glows at noon can turn flat by evening. Buy the sample pots first; they are the cheapest insurance a paint project has.