deleting photos all at once

jacob1t wrote: I want to delete a lot photos at the same time

Select them and hit command-delete. They can then be seen in the Recently Deleted view, and will be available to be restored for 30 days before being eliminated.

See this:

Select items on your Mac screen - Apple Support

Which gives these options:

• Select an item: Click the item.
• Select multiple items: Press and hold the Command key, then click the items (they don’t need to be next to each other).
• Select multiple items that are adjacent: Click the first item, then press the Shift key and click the last item. All items in between are included in the selection.
• You can also click near the first item, press and hold the trackpad or mouse button, then drag over all of the items. This method’s especially useful in the Icon view.
• Select all items in a window: Click a window to make it active, then press Command-A.
• Deselect one item when multiple items are selected: Command-click the item.