Choosing plants based on the correct sun levels is crucial for a happy, easy to look after garden.
Full sun plants love to bathe in sun all day and evening, 6 hours would be the minimum.
Part Sun plants like to get a bit of sunbathing done but will wilt and sulk if left in all day sun. 3 to 6 hrs is perfect.
There are two types of shade :
Full shade for instance under trees, areas where it feels gloomy and dark.
North facing or other areas which don't receive direct sunlight but are not dark. Use a combo of shade and part sun plants.