MacBook showing unexpected notifications; is it hacked?

How can I tell if my Mac book has been hacked? help please.

I have early onset dementia so please no tech talk but simple instructions/suggestions.

I keep getting notifications pinging up in the top right had side of my screen. They are varied but I have a new one today.

I don't have any protection on here as I was told I didn't need it.

I don't use this for business. Its emails, browsing, photos and editing using apple apps.

I have attached some copies of the messages that came up. They aren't there for long but Ive never clicked on them in case. But the fact they come up is a worry and don't know how to stop them.

I will be so grateful for any insight or help you can provide.

Please ignore A Dorris message. Bless her.