How to Maintain Existing Paint
Moisture can warp or ruin paint and underlying drywall. It can also attract dangerous mold. Ventilate properly and avoid getting paint wet beyond a quick wipe with a damp rag for cleaning.
Check for cracks in your paint. You may need to touch up paint after one year in a new home. Settling often occurs and creates small cracks, but it should no longer be an issue after the first year. Cracks from settling are most likely to appear around door and window frames. The cracks are likely in the drywall, and they need to be mudded and fixed before repainting. Otherwise the cracks will return.
On the other hand, small cracks and peeling in the middle of the wall may be caused by a poor paint job. You may need to peel away the paint and replace both the primer and paint.
To match the color, keep leftover paint for a couple of years. Latex paint typically expires after two to five years. After that, recycle the paint at designated facilities. First, write down the paint name or code and the brand, if possible, in case you need to return to the store and buy more of the same paint.