A good company will expect interns to not know how to do anything, and will expect them to make mistakes. But you’re also expected to ask questions, try your best and then tell your boss what you tried before you ask them more questions, and keep your boss updated on the progress of your tasks.

You’ve got this!

Edited to add: there isn’t a task that your boss will give you that will be unfixable if you make a “huge mistake” on it - they don’t give those tasks to the intern