Generally speaking pruning is done when shrubs or plants are dormant.
It is best to do a bit of research on specific plant types.
Gardening Know How is a great place to do this!
Use the 'search' tab at the top of the page. Enter the plant name and most plants will have pruning information available in the articles.
We welcome any questions.
If your unclear on the plants that you do have, you can also upload images.