How to repair .zip files?

To begin with, I don't know a single thing about coding, computers, etc. It'd be nice of computer masters if my question could be answered in detail (ex: type this in, screenshot, if possible).

First of all, I received several .zip files on my MacBook Air. I don't even know what kind, but the whole thing is around 31.5 cm wide and 23 cm long.

I think the .zip files contain .img files, probably more than 4000. The reason behind this huge file is because we're making an album of a bunch of pictures. However, I'm not sure if these images are screenshots or .gifs.

For some reason, the files that I receive look like images to me, but the extension sometimes says .gif instead of .img.

Now, when I try to open the .zip files, a notice that reads:

Cannot read archive data.

to which I usually press 'Ignore All' or 'Stop'.

Since 'Stop' is highlighted in blue, it looks promising. I press on it, and it says:

Cannot read archive data.

The same thing happens when I press on 'Ignore All'.

I tried to look for a solution already, to which this one website told me to use something called Terminal. (The .zip file's name is memories.)

I assumed that the .zip files were corrupted, so (as the website told me) I entered:

zip(enter)-F memories.zip --out please.zip

This didn't work. This showed up:

Fix archive (-F) - assume mostly intact archive    zip warning: No .zip file found        (If all you have are splits (.z01, .z02, ...) and no .zip, try -FF)zip I/O error: No such file or directoryzip error: File not found or no read permission (memories.zip)

I tried the following:

-FF memories.zip --out please.zip

Still didn't work. This showed up:

Fix archive (-FF) - salvage what can    zip warning: could not open input archive: memories.zipScanning for entries...Could not find:  memories.z01Hit c      (change path to where this split file is)    s      (skip this split)    q      (abort archive - quit)    e      (end this archive - no more splits)    z      (look for .zip split - the last split) or ENTER  (try reading this split again):

I stopped here, as I didn't have a clue what to do next. Can someone please help me...?