Take the file format extension you are interested in and search for it in
Google. Find out if it is already compressed. Dozens of types are and it is
not possible for me to go down the list and tell you about every file
extension that exists.

http://www.file-ext.com/

Richard never said a exe or jpg could not be zipped.  He inferred that an
executable could not be compressed to any appreciable extent.  Which, I
agree with.
He's talking compressibility.  Routines and subroutines created then altered
to pure machine language as executables are compressed by that very process.
Files as zip and tar have compression as part of their programming on other
files, not themselves during that process.  And, there is an extent of
compressibility option as part of zipping.
To answer your question bluntly, yes and no.  If appreciable compression is
understood on your part as part of zipping, no to all file formats other
than the 2 you mentioned.  If not, yes.

No, nobody said that exe and jpg files can't be zipped. *Any* file can be
zipped. The question is whether zipping compresses files. In general zipping
exe and jpg files (and some other types) provides litle, if any, compression

Richard mentioned one reason why you might zip a file that can't be
compressed. I'll mention a couple of others:

1. A zipped file can be password-protected.

2. A zipped file can contain more than one individual file. If you have
several files you want to treat as a single package (for example, the
component files of a an application), it can be very convenient to package
them as a single entity. That makes it easy, for example, to E-mail it to
someone, or to put it on a web site where it can be downloaded by others as
a single file.