Bring colour into your home
In my opinion there are no rules when it comes to colour. You choose colours and colour combinations based on feeling, what suits you, what makes you happy. This also makes an interior 'your' interior and ensures that it fits you like a warm blanket. If you find it difficult to make colour combinations, you can always enlist the help of an interior designer. My advise is to stick to a colour brochure from Pure & Original, for example. This already provides a kind of framework, instead of the thousands of colours in a hardware store that only make the choice even more difficult. You don't need so many different colours to get a good combination. Finally, you can request sample cans of your favorite colours and use them to paint a sheet of A3 paper, for example. Hang these in different places in the house and view the colours at different times of the day, so you can also see what the light does to a colour.
This way you can also see how the colour matches your furniture and how they can enhance different spaces. And do you enjoy painting? Then take the ceiling with you, you will certainly not regret this!