WHY IF I USE SAFARI ON MANY SITES I CAN'T SEE THE IMAGES? I HAVE CATALINA 10.15.7

+ 2 Safari 15 in Catalina is out-dated and you need to use FireFox or Brave.

FWIW I have a 2012 Mac mini running Catalina that I use as a media server. Because Safari 15 in Catalina no longer supports Xfinity Live TV and other streaming services, I use FireFox instead.

Usually means it is not downloading the images. You can try a refresh.

If it gets really bad, you can try a more modern browser like Firefox.

Agree with Keith, or Might try this, it's Chrome Browser without google & without Ads...

https://brave.com/