It's great to hear that you're trying out SFML for the first time. Based on the code and commands you provided, it seems like you've followed the correct steps for compiling and running the SFML application.
However, if nothing happens when you execute the "./sfml-app" command, there might be a few potential issues to consider:
Double-check that you have correctly set the "<installation-de-sfml>" placeholder in the compilation and library paths to the actual path where SFML is installed on your system.
Make sure you have all the necessary SFML dependencies installed on your machine. SFML requires certain libraries to function properly, so ensure that they are correctly installed.
Verify that you have the appropriate versions of the SFML libraries for your system architecture (in your case, 64-bit). Mismatched library versions can cause issues.
Check for any error messages or warnings during the compilation process. Even if the application compiles successfully, there may be runtime errors that prevent it from running correctly.
I hope these suggestions help you troubleshoot the issue. If the problem persists, please provide any error messages or additional details for further assistance. Good luck with your SFML project!