Members of the brassica family don't like the heat of the greenhouse (i.e. cabbages, sprouts, broccoli, cauli etc).
Quite a lot of plants don't need to be in the greenhouse once they have germinated (e.g. broad beans) or once the risk of frost has passed (e.g. climbing beans).
Some other plants will grow best in there e.g. some varieties of tomatoes, cucumbers, peppers, chillis, aubergine etc.
What are you hoping to grow, and what size GH do you have? It's usually a case of having to prioritise what you can fit in.