Hi laylabernaerts,
Thank you for posting. I understand you're having an issue with Safari on your MacBook Air, and I'm glad to help out.
Which exact macOS version are you using under Apple menu () > About This Mac?
As a test, try force-quitting Safari, and then press and hold Shift on your keyboard while you re-open Safari; this will bypass the saved state the app was last in, and it may help to resolve the issue.
If that doesn't help, I recommend trying the suggested steps here next: If Safari is slow, stops responding, quits unexpectedly, or has other issues
I hope this helps get you started. Best wishes.