what will happen if i delete Application Support folder in my macbook air

Hi.

Deleting the entire Application Support folder will almost certainly break apps and some system functions. This folder stores important data required for apps and macOS to work properly.

To free up space safely, only delete folders for apps you’ve fully uninstalled or no longer use. Avoid removing any folders starting with com.apple or related to system processes.

Using Storage Management (Apple menu > About This Mac > Storage > Manage) is recommended to find safe ways to clear space.

Thanks for understanding.

Using Disk Utility, what size is your storage, and how much of it shows "free."