For Linux distros most programs are stored in the /usr directory. There is no “Programs Files” directory like for Windows. The executables are typically stored in /usr/bin with additional stuff in /usr/share and libraries in usr/lib etc.
There is also usr/local where stuff gets put when you do the compiling yourself. With /bin tending to be command line tools and /sbin being the directory for command utils only for root.
The quickest way to find the actual directory a program resides in is through terminal using the command “which”.
Here are some examples:
The programs referenced are the preinstalled text editor, image viewer and web browser. All of these examples will return the /usr/bin/ directory.
Note chromium is referred to as “chromium-browser” as typing “which chromium” will return no result as that is the incorrect name for the program. If you are unsure of a program name, run the program and then look for it in task manager to confirm.