I just found a great app on Google Chrome (not on Firefox which I previously used for Garden.org).
If you go onto the main page for Google Chrome, click on the App icon (a bunch of multicolored dots), go into the Web Store search EXIF, then download the free App called EXIF Viewer (by Rodriguez).
Now if you hover over a photo you have opened in it's own window, at the top the app tells you some of the "metadata" or "EXIF" about the photograph. It generally includes what camera (important due to sensor size but they don't directly tell you sensor size), what focal length lens, the ISO, Aperture and shutter speed, and whether a flash was used (some photographers block this info so it does not always work).
I can look at a photo I like, and then get an idea how they did it. Wow!

Hi Mary,

Thanks - didn't know there was an addon for Chrome to do this. You might be interested to know that Flickr, a photo-sharing website, also displays all the relevant EXIF data (where photographers have included it) with the uploaded photos. So if you come across a photo you like, you can generally work out what camera was used and what it was set to.

I have an EXIF viewer program. Great for me. I can look at setting and such. I teach many different photography classes and in all of them (when the subject comes up) I advise my students to always remove EXIF info from any copy of the pix they make and are about to share, post on-line. It's a privacy, security thing. No one else needs to know what camera you use, when you took the pix. Newer cameras even include GPS info in the EXIF. No one else needs to know exactly here you were standing. OK ,this may seem extreme to some of you, but today it is good advice. Gene

Yes I wondered about the GPS thing- it means someone could figure out where you live. This app does not show that. I did not turn it on in my camera for that reason.
I have been studying Flickr photos as my Photography Teacher mentioned that capability, I think I have learned a tremendous amount in just a week or so. And it is fun to look in Flickr, see what is "trending". If I see something I really like, then I can look at other photos from the same photographer. Or there are search terms. I think the region in Eastern Washington called "The Palouse" is absolutely gorgeous. Now I can look at pictures from there. There are some photography multi-day workshops that go there, it is that beautiful. Maybe I will do that someday.

No chance to hide the secrets of pics

I found another IPhone App I like. I spent an hour on the sofa playing with it. It is called SetMyCamera. I got the free version, and I tolerate the ads quite well. This one is a DOF (Depth of Field) App, to help determine the "Hyperfocal Distance" This is used mostly in Landscape photography, and is a calculation for the specific lens length, to determine where to set the focus for a particular depth of field to include infinity (the horizon) and something close up. So for my camera sensor size, if I use my 20mm lens, I can set the focus at 48", now I have a area from 24" to infinity that is in focus. If I set the focus at 45" instead, it goes from 23" to 80 ft which is very different. I always wondered how they got those neat photos of an alpine wildflower in bloom, and crisp snowy peaks behind. Now I know. I will try this this spring!