Safari can't open the page?

I haven't been able to open multiple pages in Safari for a few days. I always get this error message:

Safari can't open the page "https://www…" because Safari can't establish a secure connection to the server "http://www…"

These include pages such as Netflix and Paypal, which are trustworthy and which I could always open. What can that be?

I also had my cell phone completely off and everything went back to the charger later

Unfortunately that does not work. For me it is also on the MacBook and not on the mobile phone: /

Oh, maybe change your browser

I think you can still open Safari.

Open it and go to "Settings". There you will also find a "Data protection" tab. Open it and click on "Manage website data". With a little luck you can delete this memory and then your Safari should work fine again.

Think about switching to "Firefox"! I like the browser better.